Question 377331
Gather like terms,
{{{(9.8x^2 -2.2x- 7.8) + (-4.9x^2 - 1.1x + 7)=(9.8x^2-4.9x^2)+(-2.2x- 1.1x) +(- 7.8+7)}}}
{{{(9.8x^2 -2.2x - 7.8) + (-4.9x^2 - 1.1x + 7)=(4.9x^2)+(-3.3x)+ (-0.8)}}}
{{{highlight((9.8x^2 - 2.2x -7.8) + (-4.9x^2 - 1.1x + 7)=4.9x^2-3.3x-0.8))}}}