Question

if A=3+5x+x,B=-4-7x+x,C=4+5x-8x findA+B+C​

Answer 1

$= \: a + b + c \\ (3 +5x + 7 {} x {}^{2} ) + ( - 4 - 7x + x) + (4 + 5x - 8x) \\ = (7 {x}^{2}) + (5x - 7x - x + 5x - 8x) +( \ 3 - 4 + 4) \\ = \ 7x {}^{2} ( + 11x - 15x) + (3) \\ = 7x {}^{2} - 4x + 3 \\ hope \: it \: will \: help \: you \:$