Question

( 5x 2nd power + 2 ) - ( -4x 2nd power + 7 ) + ( - 3x 2nd power - 5 ) =

A 5x to the power of 2 - 9
B 9x to the power of 2 - 10
C 6x to the power of 2 - 10
D 5x to the power of 2 - 10

Answer 1

C

Explanation:

5x 2nd power -(-4x 2nd power) makes it a positive which is 9x 2nd power then 9x 2nd power +(-3x 2nd power) which + and - make it 9x 2nd power-3x 2nd power which equals 6x 2nd power. The only answer choice with 6x 2nd power is C.