х (4 - х) = 0.

х² + 5 х = 0.

х² + 4 х + 4 = 0.

4 х² - 64 = 0.

15 х² - 3 х = 7 х² + 5 х.

Х (4-х) = 04-2 х=02 х=4 х=2

1) x (4-x) = 0

x=0 x=4

2) x^2+5x=0

x (x+5) = 0

x=0 x=-5

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

(x+2) ^2=0

x=-2

4) 4*x^2-64=0

4 (x^2-16) = 0

4 (x-4) (x+4) = 0

x=4 x=-4

5) 15*x^2-3x=7*x^2+5x

15*x^2-7*x^2-3x-8x=0

8*x^2-11x=0

x (8x-11) = 0

x=0 x=11/8