Решите уравнения: -1+100x^2=0 14x^2+7x=0 2x^2-7x+6=0

Question

Решите уравнения:
-1+100x^2=0
14x^2+7x=0
2x^2-7x+6=0

Answer 1

100x^2 - 1 = 0 
100x^2 = 1
x^2 = 1/100
x1 = - 1/10 = - 0,1
x2 = 1/10 = 0,1

14x^2 + 7x = 0 
2x^2 + x = 0 
x (2x + 1) = 0 
x = 0 
2x + 1 = 0 ==> 2x = - 1 ==> x = - 0,5

2x^2 - 7x + 6 = 0 
D = 49 - 48 = 1
x1 = ( 7 + 1)/4 = 8/4 = 2
x2 = ( 7 -  1)/4 = 3/2 = 1,5