Question

resolva as equaçoes usando a formula de baskara

A) (5+x).( 4+x) = 42

Answer 1

Olá, boa noite ☺

Resolução:

(5+x).( 4+x) = 42
20+5x+4x+x²=42
x²+5x+4x+20-42=0
x²+9x-22=0

Coeficientes:

a=1, b= 9 , c= -22

Δ=b²-4ac
Δ=9²-4.1.(-22)
Δ=81+88
Δ=169

Valores de x:

x=-b±√Δ/2.a
x=-9±√169/2.1
x=-9±13/2

x'=-9+13/2=4/2=2
x''=-9-13/2=-22/2=-11

Bons estudos :)