Question

determine as espressoes :A=5(x-3)-2x(x-3) e B =4-(3x+1)².resolva a equaçao A=B-18

Answer 1

Resposta:

A=5(x-3)-2x(x-3)

A=5x-15-2x^2+6x

A=-2x^2+11x-15

B=4-(9x^2+6x+1)

B=4-9x^2-6x-1

B=-9x^2-6x+3

-2x^2+11x-15=-9x^2-6x+3-18

-2x^2+11x-15+9x^2+6x+15=0

7x^2+17x=0

x(7x+17)=0

x=0

7x+17=0

7x=-17

x=-17/7

Explicação passo-a-passo: