Question

Решите уравнения:
1.4x^2+7=7+24x
2.x^2-x=12
3.x^2-x-6=0
4.x^2+3x=4
5.x^2=2x+8

Answer 1

x²-x=12
x²-x-12=0
a=1 b=-1 c=-12
D=b²-4ac=(-1)²-4×1×(-12)=1+48=49=7²>0
x1=1+7/2=4
x2=1-7/2=-3