Question

найдите корень уравнения :
( 2х - 5 ) ( 2х + 5 ) = 75;
( х - 9 ) ^ 2 = 49;
( 3х -7)^ 2 = 121;
( х + 5 ) = 2;

Answer 1

1)4x2-25=75
4x2=100
x2=25
x=5
2)2x-18=49
2x=67
x=33.5
3) 6x-14=121
6x=135
x=22.5
4)x=-3