Question

（1-X^2）=X-1(Y+根号2)^2=4根号2Y（3-T）^2+T^2=9(2X+3)^2=3(2X+3)(2X+1

Answer 1

1.(x^2-1)+x-1=0,(x-1)(x+1)+x-1=0,(x-1)(x+2)=0,

x=1,-2

2.(y+√2)^2-4√(2y)=0,y^2+2√(2y)+2-4√(2y)=0,

y^2-2√(2y)+2=0,(y-√2)^2=0,y=√2

3.(3-T)^2+T^2-9=0,T^2-6T+9+T^2-9=0,2T^2-6T=0,

2T(T-3)=0,T=0,3

4.(2x+3)^2-3(2x+3)=0,(2x+3-3)(2x+3)=0,2x(2x+3)=0

x=0,-3/2

5.(2x+1)^2-(2-x)^2=0,[(2x+1)-(2-x)][(2x+1)+(2-x)]=0,

(3x-1)(x+3)=0,x=1/3,-3

6.x^2+10x-11=0,(x-1)(x+11)=0,x=1,-11

7.y^2-17y+30=0,(y-2)(y-15)=0,y=2,15