Question

Sendo A = x - 3, B = x² + 3 e C = 9x, o valor de A² - B + C é?

Answer 1

$A^2-B+C \\ (x-3)^2-(x^2+3)+9x \\ x^2-9-x^2+3+9x \\ 9x-6$

Answer 2

Vejamos: A^2 + B + C = (x - 3)^2 + x^2 + 3 + 9x = x^2 - 6x + 9 + x^2 + 3 + 9x = x^2 + x^2 - 6x + 9x + 9 + 3 = 2x^2 + 3x + 12