Răspuns :
(x+1)(x+2)=72
x²+3x+2-72=0
x²+3x-70=0
Δ=b²-4ac
Δ=9+280
Δ=289
√Δ=17
x₁=(-3-17)/2=(-10)
x₂=(-3+17)/2=7
x²+3x+2-72=0
x²+3x-70=0
Δ=b²-4ac
Δ=9+280
Δ=289
√Δ=17
x₁=(-3-17)/2=(-10)
x₂=(-3+17)/2=7