分解因式
-4x²+4xy+11y²
x²-2x-4
参考答案:解;-4x²+4xy+11y²
=-(4x²-4xy+y²)+12y²
=12y²-(2x-y)²
=(2√3+2x-y)(2√3-2x+y)
x²-2x-4
=x ²-2x+1-5
=(x-1) ²-5
=(x-1+√5)(x-1-√5)
-4x²+4xy+11y²
x²-2x-4
参考答案:解;-4x²+4xy+11y²
=-(4x²-4xy+y²)+12y²
=12y²-(2x-y)²
=(2√3+2x-y)(2√3-2x+y)
x²-2x-4
=x ²-2x+1-5
=(x-1) ²-5
=(x-1+√5)(x-1-√5)