Question

x+7 ..x+5

e muoltiplicaçao pessoal

Answer 1

(x+7) . (x+5)
x^2+5x+7x+35
x^2+12x+35=0

Δ =b² - 4ac 
Δ = 12^2-4.1.35
Δ= 144-140=4 

 x = - b ±  V Δ / 2.a
 x= -12 ± V4/2.1
 x= -12 ± 2 / 2

x1= -12+2 /2= -10/2= -5
x2= -12-2 / 2= -14 /2= -7