Toán Lớp 8: a.(x bình+5) (x-4)
b. (2x-4) mũ 2 +(4x+5) (2x-3)
c. (4x-7)mũ 2 -(3x-2) (2x+3)
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Toán Lớp 8: a.(x bình+5) (x-4)
b. (2x-4) mũ 2 +(4x+5) (2x-3)
c. (4x-7)mũ 2 -(3x-2) (2x+3)
Comments ( 2 )
$=x^3-4x^2+5x-20$
$b. (2x-4)^2 +(4x+5) (2x-3)$
$=4x^2-16x+16 + 8x^2-12x+10x-15$
$=12x^2-18x+1$
$c. (4x-7)^ 2 -(3x-2) (2x+3)$
$= 16x^2-56x+49 -(6x^2+9x-4x-6)$
$= 16x^2-56x+49 -6x^2-9x+4x+6$
$= 10x^2-61x+55$