Question

(x +3)² = 4² + 3² .. qual o valor de x?

Answer 1

(x+3)² = 4² + 3²
(x+3)² = 16+9
(x+3)² = 25
x²+6x+9 = 25
x²+6x-16 = 0

Δ = 6²-4(1)(-16)
Δ = 36 + 64
Δ = 100

x = -6+-10 / 2

x' = -6-10 / 2 = -16/2 = -8

x'' = -6+10 / 2 = 4/2 = 2