Question

Short answer. Add the following:
(-15x^2+7.9x+8.6)+(-5.5x^2-7.8x+5.2)

Answer 1

please help me someone with this problem

Answer 2

Add like terms,
\[\Large -20.5 x^2+0.1 x+13.8\]

Answer 3

-15x^2 + -5.5x^2=-20.5x^2
7.9x+7.8x=0.1x
8.6+5.2=13.8
therefore; -20.5x^2+0.1x+13.8

Answer 4

so is that the final answer