Question

 

х(4 – х) = 0.

х² + 5х = 0.

х² + 4х + 4 = 0.

4х² – 64 = 0.

15х² – 3х = 7х² + 5х.

Answer 1

х(4-х)=04-2х=02х=4х=2  

Answer 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