Question

Решите уравнение:7x^2+20х-3=0

Answer 1

D=20^2-4*7*(-3)=484 X1=(-20+sqrt(D))/2*7=1/7 X2=(-20-sqrt(D))/2*7=-3

Answer 2

7x^2+20х-3=0
D=400+84=484
x1=(-20+22)/2*7=2/14=1/7
x2=(-22-20)/14=-42/14=-3