-a²+81=?;9y³-4y=?若x²+4x+a=【x+2】²-1成立,这满足上式a的值为_____?
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-a²+81=?;9y³-4y=?若x²+4x+a=【x+2】²-1成立,这满足上式a的值为_____?
-a²+81=?;9y³-4y=?
若x²+4x+a=【x+2】²-1成立,这满足上式a的值为_____?
-a²+81=?;9y³-4y=?若x²+4x+a=【x+2】²-1成立,这满足上式a的值为_____?
1、=81-a²=9²-a²=(9+a)(9-a)
2、=y(9y²-4)=y(3y+2)(3y-2)
x²+4x+a=x²+4x+4-1
∴a=4-1
a=3