Question 552401
={{{(-7.4x^2+1.8x-8.5) + (2x^2+6x+2.3)}}}
={{{-7.4x^2+1.8x-8.5+2x^2+6x+2.3}}}
Combine like terms
={{{-7.4x^2+2x^2+1.8x+6x-8.5+2.3}}}
={{{-5.4x^2+7.8x-6.2}}}