Question

Решить графически.
1){y=x
{y=3x-4

2)x^2=1
3)x^2=x+2
4)x^2+2x-3=0

Answer 1

4) x^2 + 2x - 3=0
D=b^2-4ac= 2*2-4*1*(-3)=4+12=16=4^2
x1,2=-b+-D/2a=-2+-4/2
x1=1 x2=-3