Toán Lớp 8: C, x^2-2x-15
D, x^2+4y^2-4xy-4
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Toán Lớp 8: C, x^2-2x-15
D, x^2+4y^2-4xy-4
Comments ( 2 )
=($x^{}$- $1^{}$)$^{2}$-$4^{2}$
= $^{(x^{}-5)(x+3)}$
$x^{2}$ + $4y^{2}$-4$xy^{}$-4
= $x^{2}$- $2x.2y^{}$$+^{}$ $2y^{2}$ $-2^{2}$
=($x^{}$- $2y^{}$)$^{2}$-$2^{2}$
= $^{(x^{}-2y-2)(x-2y+2)}$