Question

(x方加y方加1）（x方加y方加3）=8则x方加y方的值为

Answer 1

(x²+y²+1)(x²+y²+3)=8(x²+y²)²+3(x²+y²)+(x²+y²)+3-8=0(x²+y²)²+4(x²+y²)-5=0(x²+y²+5)(x²+y²-1)=0x²+...