Question

Find the difference. (9a^4+2a^2+5)-(16a^4-7a^2+1)

A. 25a^4-5a^2-4
B. -7a-5a^2+6
C. 25a^8+9a^4+6
D. -7a^4+9a^2+4

Answer 1

(9a^4+2a^2+5)-(16a^4-7a^2+1)
=9a^4 + 2a^2 + 5 - 16a^4 + 7a^2 - 1
=-7a^4 + 9a^2 + 4

answer is D. -7a^4+9a^2+4