解方程;(x+3)(x-3)=(2x+1)²-3x²
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解方程;(x+3)(x-3)=(2x+1)²-3x²
解方程;(x+3)(x-3)=(2x+1)²-3x²
解方程;(x+3)(x-3)=(2x+1)²-3x²
x²-9=4x²+4x+1-3x²
x²-9=x²+4x+1
4x=-10
x=-5/2
(x+3)(x-3)=(2x+1)²-3x²
x²-9=4x²+4x+1-3x²
4x+10=0
x=-5/2
(x+3)(x-3)=(2x+1)²-3x²
x^2-9=4x^2+4x+1-3x^2
x^2-9=x^2+4x+1
x^2-9-x^2-4x-1=0
-4x=10
x=10/(-4)
x=-5/2
(x+3)(x-3)=x²-9
(2x+1)²-3x²=4x²+4X+1-3x²=x²+4X+1
x²-9=x²+4X+1
-10=4X
x=-2.5