(5x-3)(x+1)=(x+1)^2+5

2025-03-04 21:45:30
推荐回答(2个)
回答1:

(5x-3)(x+1)=(x+1)^2+5

5x²+5x-3x-3=x²+2x+1+5
4x²-9=0
(2x+3)(2x-3)=0
x1=-1.5, x2=1.5

回答2:

(5x-3)(x+1)=(x+1)^2+5

(5x-3)(x+1)-(x+1)^2-5=0

(5x-3-x-1)(x+1)-5=0

(4x-4)(x+1)-5=0
4(x-1)(x+1)-5=0
4(x²-1)-5=0
4x²-4-5=0
x²=9/4
x=±3/2