Evaluate the following expression using the values given:

Find -a2 - 3b3 + c2 + 2b3 - c2 if a = 3, b = 2, and c = -3.

-67

-17

-31

1

I got 19 what am i doing wrong?

Question

Evaluate the following expression using the values given:

Find -a2 - 3b3 + c2 + 2b3 - c2 if a = 3, b = 2, and c = -3.

 -67

 -17

 -31

 1

I got 19 what am i doing wrong?

anonymous · Answer

$$-a ^{2}-3b ^{3}+c ^{2}+2b ^{3}-c ^{2}$$

anonymous · Answer

$$9-3(8)+9+2(8)+9$$

anonymous · Answer

$$9-24+9+16+9$$

anonymous · Answer

$$19$$

anonymous · Answer

Probably -9-24+9+16-9

anonymous · Answer

the nines become positive because a negative times a negative is positive

anonymous · Answer

But if you square the number first such as a^2 you get 9. The operand comes second thus it is -9

anonymous · Answer

@ganeshie8 @phi @mathstudent55 @zaibali.qasmi @paki ?

anonymous · Answer

so you would put it in parenthesis then square and do the negative?

anonymous · Answer

you were right thanks

anonymous · Answer

Your welcome...I have been fooled by the same thing