Question

Determine a raiz :

a-f(x)=x²-4

Answer 1

Vejamos: f(x) = x^2 - 4 f(x) = 0 x^2 - 4 = 0 x^2 = 4 x = +-√4 x = +-2 As raízes são -2 e 2.

Answer 2

Delta possui valor igual a 16, logo o valor de X' e X'' será 2 e -2, dada as fórmulas Δ=b²-4.a.c e X=Δ, então teremos:
Δ=0²-4.1.(-4)
Δ=16
X'=-0+-$\frac{-0+ \sqrt{16} }{2.1}$= 2
X''=-0+-$\frac{-0- \sqrt{16} }{2.1}$= -2