(y+z)(y+z)=49怎么解(y+z)(y+z)=49简化的话是这样吧?y平方+2yz+z平方=49

Question

(y+z)(y+z)=49怎么解
(y+z)(y+z)=49
简化的话是这样吧?
y平方+2yz+z平方=49

Answer 1

(y+z)(y+z)=49
(y+z)²=49
y+z= ±7
只有一个方程,有两个未知数,答案只能如此