Question

解一元二次方程.(1)2X^2+6=7X (2) （2－X）^2+X^2=4

Answer 1

2X^2+6=7X

2X^2-7x+6=0

(2x-3)(x-2)=0

x=1.5 x=2

（2－X）^2+X^2=4

X^2-4x+4+X^2=4

2X^2-4x=0

2X(x-2)=0

x=0 x=2