Question

Sendo A = x - 3, B = x² + 3 e C = 9x, o valor de A²-B +C é:
a) 3 ( x + 4)
b)x+4
c) 3 (x + 2)
d) x + 2
e) 3x
​

Answer 1

Resposta:

A= x-3

B= x^2+3

C= 9x

A^2 -B+C

=(X-3)^2 -(x^2 +3)+(9x)

=(x-3).(x-3) -x^2 -3+9x

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

=3x+6