Question

WItam!
rozwiąż równanie kwadratowe...
10(x-2+19)=(5x-1)*(1+5x)

Answer 1

10(x - 2 + 19) = (5x - 1)*(1 + 5x)
10(x + 17) = (5x - 1)*(5x + 1)
10x + 170 = 25x² - 1
25x² - 10x - 171 = 0

Δ = 100 + 25*4*171 = 100 + 100*171 = 100*172 = 10*10*2*2*43
√Δ = 20√43

x₁ = (10 + 20√43)/50 = (1 + 2√43)/5
x₂ = (10 - 20√43)/50 = (1 - 2√43)/5
jak masz pytania to pisz na pw