[-2 + (-7)]^3 is not the same as (-2)^3 + (-7)^3 in (-2)^3 + (-7)^3, it means multiplying then adding. but the numbers are inside the bracket [-2 + (-7)]^3 and the we should do the working inside the bracket first. so the correct working is: [-2 + (-7)]^3 = -9 x (-9) x (-9) = -81 x (-9) = -729

It should not be (-2)^3 + (-7)^3 as it is totally different from [-2+(-7)]^3.

It is (-2+(-7) raised to the power of 3 and not the sum of the individual integers as in (-2+(-7), it is raised to the power of 3 after they are added.

All of you are right! We should do what's in the bracket first since the power 3 is outside the bracket. Some of you explained pretty well :D

The following presentations needs to be improved on: 1. Some of you put down answer as (-729). If it is the final answer, we should not write the () any more. So, answer should be written as -729

2. Second line of Darryl's working: =[-2=(-7)][-2=(-7)][-2=(-7)] Did Darryl typed the sign incorrectly? (have to hold shift key)

3. We should not write =(-9 x -9 x -9) we cannot park x and - side by side without any () It should therefore be rewritten as =(-9) X (-9) X (-9)

It should not be (-2)^3+(-7)^3 because it is not the same as (-2+(-7))^3

ReplyDeleteAns:(-729)

ReplyDeleteThis comment has been removed by the author.

ReplyDeleteThis comment has been removed by the author.

ReplyDeleteit is not (-2)^3+(-7)^3 because the answer of the sum is not equivalent to (-2+(-7))^3

ReplyDeleteThe working in the Big brackets should be done first. Then it would become (-9)^3=-729

ReplyDeleteThe working should be within the bracket first

ReplyDelete(-9)^3=-729

(-2)^3 + (-7)^3 is not the same as (-9) X (-9) X (-9). The answer should be (-729).

ReplyDeleteIt should be (-9)^3

ReplyDelete=(-9 x -9 x -9)

=(-729)

it should be [-2-(-7)]^3 and not (-2)^3+(-7)^3 because (-2)^3+(-7)^3 is different from [-2-(-7)]^3

ReplyDelete[-2-(-7)]^3=-729(correct answer)

(-2)^3+(-7)^3=-351

This comment has been removed by the author.

ReplyDeleteThe correct working should be:

ReplyDelete[-2+(-7)]^3

=[-2+(-7)]x[-2+(-7)]x[-2+(-7)]

=(-9)(-9)(-9)

=81x(-9)

=(-729)

[-2 + (-7)]^3 is not the same as (-2)^3 + (-7)^3

ReplyDeletein (-2)^3 + (-7)^3, it means multiplying then adding. but the numbers are inside the bracket [-2 + (-7)]^3 and the we should do the working inside the bracket first.

so the correct working is:

[-2 + (-7)]^3

= -9 x (-9) x (-9)

= -81 x (-9)

= -729

The person who did this should work out the -2+(-7) first. Then it should be okay and the answer should be (-9)(-9)(-9)= (-729)

ReplyDelete=(-2+(-7))x(-2+(-7))x(-2+(-7))

ReplyDelete=(-9)x(-9)x(-9)

=-729

[-2+(-7)]^3

ReplyDelete= (-9)^3

= 729

(-2+(-7))^3

ReplyDelete=(-9)^3

=-729 (Ans)

[-2+(-7)]^3

ReplyDelete=-9^3

-729

The working in the bracket should be done first

ReplyDelete[-2-(-7)]^3=-729

The working is wrong.

ReplyDeleteInstead of....

( -2+(-7) )^3

=(-2)^3 + (-7)^3

=-8 + (-393)

= -351(Ans)

It should be...

( -2+(-7) )^3

=(-9)^3

= -729(Ans)

It should be [-2-(-7)]^3 as [-2-(-7)]^3 is different from (-2)^3+(-7)^3

ReplyDeletecorrect answer:

[-2+(-7)]^3

=[-2+(-7)]x[-2+(-7)]x[-2+(-7)]

=(-9)(-9)(-9)

=81x(-9)

=(-729)

The workings in the outer brackets must be done first.After that, take(-9)^3which will give you -729

ReplyDeleteThe answer should be:

ReplyDelete(-2+-7)^3

=-9^3

=729

Sorry -729

ReplyDeleteThe workings in the first brackets should be solved first. So,(-2+(-7))=-9. (-9)^3= -729

ReplyDeleteWe should work out the (-2+(-7)) first and then (-9)(-9)(-9)so the answer is -729.

ReplyDeleteIt should not be (-2)^3 + (-7)^3 as it is totally different from [-2+(-7)]^3.

ReplyDeleteIt is (-2+(-7) raised to the power of 3 and not the sum of the individual integers as in (-2+(-7), it is raised to the power of 3 after they are added.

Therefore, the method is:

[-2+(-7)]^3

= (-9)^3

= -729

-Christopher Nah

[-2+(-7)]^3

ReplyDelete=[-2=(-7)][-2=(-7)][-2=(-7)]

=-729

All of you are right! We should do what's in the bracket first since the power 3 is outside the bracket. Some of you explained pretty well :D

ReplyDeleteThe following presentations needs to be improved on:

1. Some of you put down answer as (-729).

If it is the final answer, we should not write the () any more. So, answer should be written as -729

2. Second line of Darryl's working:

=[-2=(-7)][-2=(-7)][-2=(-7)]

Did Darryl typed the sign incorrectly?

(have to hold shift key)

3. We should not write

=(-9 x -9 x -9)

we cannot park x and - side by side without any ()

It should therefore be rewritten as

=(-9) X (-9) X (-9)