Question

解方程 1.4X^2-256=0 2.4(x-2/1)^2=1 3.-x^2+2x+3=0 4.3x^2+8x-3=0

Answer 1

1.4X^2-256=0

4x^2=256

x^2=64

x1=8,x2=-8

2.4(x-1/2)^2=1

(x-1/2)^2=1/4

x-1/2=1/2,x-1/2=-1/2

x1=1/2+1/2=1

x2=-1/2+1/2=0

3.-x^2+2x+3=0

x^2-2x-3=0

(x-3)*(x+1)=0

x1=3,x2=-1

4.3x^2+8x-3=0

(3x-1)*(x+3)=0

x1=1/3

x2=-3