X(X+2)+1=9用因式分解法解
问题描述:
X(X+2)+1=9用因式分解法解
答
x ² + 2 x + 1 = 9
(x + 1)² = 9
x + 1 = ± 3
x = ± 3 - 1
x1 = 3 - 1 = 2
x2 = - 3 - 1 = - 4