x²+2x-1
=(x+1)²-2
=(x+1+√2)(x+1-√2);
x²+4xy-4y²
=(x+2y)²-8y²
=(x+2y+2√2y)(x+2y-2√2y);
已知x²+(a+b)x+ab=x²+5x-6,试将多项式(a+b)x²+abx-8分解因式.
(x+a)(x+b)=(x+6)(x-1);
a+b=5;
ab=-6;
5x²-6x-8
=(5x+4)(x-2)
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,
x²+2x-1
=(x+1)²-2
=(x+1+√2)(x+1-√2);
x²+4xy-4y²
=(x+2y)²-8y²
=(x+2y+2√2y)(x+2y-2√2y);
已知x²+(a+b)x+ab=x²+5x-6,试将多项式(a+b)x²+abx-8分解因式.
(x+a)(x+b)=(x+6)(x-1);
a+b=5;
ab=-6;
5x²-6x-8
=(5x+4)(x-2)
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,