4x²=81请问怎么解
4x²=81请问怎么解
4x²=81
(2x)²=81
2x=9
x=4.5
4x²+12x+9=81
4x²+12x-72=0
x²+3x-18=0 解释等于两边同除以4
(x+6)(x-3)=0
所以
x1=-6 x2=3
4x²-(4x²-4xy+y²) 因式分解
4x²-(4x²-4xy+y²)
=(2x)²-(2x-y)²
=[2x-(2x-y)][2x+(2x-y)]
=y(4x-y)
4x²-(4x²-4xy+y²)
4x²-(4x²-4xy+y²)
=4x²-4x²+4xy-y²
=4xy-y²
=y(4x-y)
4x²-9=0怎么解
4x²-9=0
(2x+3)(2x-3)=0
x=-3/2或x=3/2
(-4x²+5)(-4x²-5)
(-4x²+5)(-4x²-5)
=(4x²-5)(4x²+5)
=16x的4次方-25
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因式分解(4x²+1)²-8x(4x²+1)+16x²
(4x²+1)²-8x(4x²+1)+16x²
=[(4x²+1)-4x]²
=(4x²-4x+1)²
=(2x-1)⁴
分解因式:x²-4x²+4x=?
x²-4x²+4x=-3x²+4x=x(-13x+4)
因式分解(X³+4X²-2)(X³+4X²-3)-12
(x³+4x²+1)(x³+4x²-6)
解析:
(x³+4x²-2)(x³+4x²-3)-12
=(x³+4x²)²-5(x³+4x²)+6-12
=(x³+4x²)²-5(x³+4x²)-6
=(x³+4x²+1)(x³+4x²-6)