Question

（1）3(x-5)²=25-x² （2）2（t-1）²+t=1

Answer 1

3(x-5)²+(x+5)(x-5)=0

(x-5)(3x-15+x+5)=0

x=5,x=5/2

2(t-1)²+(t-1)=0

(t-1)(2t-2+1)=0

t=1,t=1/2