Question

Resresolva as equações do 2-° grau

a)x^2-8x+15=0.





B)x^2+10x+25=0

Answer 1

a) x²-8x+15 = 0

(x-5)(x-3)=0

x₁ - 5 = 0

x₁ = 5

x₂ - 3 = 0

x₂ = 3

b) x²+10x+25 = 0

(x+5)(x+5) = 0

(x+5)² = 0                     //√

√(x+5)² = √0

±(x+5) = 0

x₁ = -5

x₂ = -5