Question

Найдите корни уравнения 1)11x²-6x-27=8x²-6x 2)-7x²+13x+9=-19+13x

Answer 1

1) 11x^2 - 6x - 27 = 8x^2 - 6x;

11x^2 - 6x - 27 - 8x^2 + 6x=0

3x^2-27=0

3x^2=27

x^2=9

x=±3

2) -7x^2 + 13x + 9 = - 19 + 13x

-7x^2 + 13x + 9 + 19 - 13x = 0

-7x^2 + 28 = 0

-7x^2=-28

x^2=-28(-7)

x^2=4

x=±2