Question

Dado: a= 13x²+4x-5
b= -8x²-2x+3
c= -15x²+5x

1) A+B=
2)C-A
3)B-A

Answer 1

a+b= 13x²+4x-5+(-8x²)-2x+3
a+b=5x²+2x-2
(a+b) x²=+2x-2-5
x²=+2x-7
x+x²=+2-7
2x²=-5
x²=-5-2
x²=-7
x= -7
-------
2
x= -3,5