1) 2x^2 = 8x2x^2 - 8x = 02x(x - 4) = 0x(x - 4) = 0x = 0 or x = 4
2) 5(x - 6) = 25x - 30 = 25x = 32x = 32/5
3) 7 + 8x = -2x - 510x = -12x = -12/10x = -6/5
4) -4x^2 + 28 = 0-4x^2 = -28x^2 = 7x = ±√7.
1) 2x^2 = 8x
2x^2 - 8x = 0
2x(x - 4) = 0
x(x - 4) = 0
x = 0 or x = 4
2) 5(x - 6) = 2
5x - 30 = 2
5x = 32
x = 32/5
3) 7 + 8x = -2x - 5
10x = -12
x = -12/10
x = -6/5
4) -4x^2 + 28 = 0
-4x^2 = -28
x^2 = 7
x = ±√7.