Question

Vă rog!
Dau coroana!
Repede!!!

Answer 1

5•3=x(x+2)
x^2 + 2x - 15 = 0
delta = 2^2 - 4•1•(-15)
delta = 4+60 = 64 =>rad.delta=8
x1=(-2-8)/2=(-5)
x2=(-2+8)/2=3
sol. (-5, 3)

Answer 2

$\frac{x}{3}=\frac{5}{x+2}$

$x(x+2)=15$

$x^{2}+2x-15=0$

Δ = 4-4·1·(-15) = 64

$x_{1}=\frac{-2+8}{2}=3$

$x_{2}=\frac{-2-8}{2}=-5$