Question

1）x²+2x=42）2y²-7y+2=0

Answer 1

x²+2x+1=5

(x+1)²=5

x=-1+√5 x=-1-√5

y²-7y/2=-1

y²-7y/2+49/16=33/16

(y-7/4)²=33/16

∴y=7/4+√33/4 y=7/4-√33/4