Question

Equação de 2°grau
88=(15+x)*(12+x)

Answer 1

88 = 15.12+15x+12x+x²

88 = 180+27x+x²

x²+27x+180 = 88

x²+27x+180-88 = 0

x²+27x+92 = 0

Δ = b²-4ac

Δ = 27²-4.1.92

Δ = 729 - 368

Δ = 361

x = -27 ± √361 / 2

x = -27 ± 19 / 2

x1 = -27+19 /2 = -8/2 = -4

x2 = -27-19 /2 = -46/2 = -23