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a, = x2 - 6x + 9 - 1 = (x - 3)2 - 12 = (x - 4)(x - 2)
b, = 4x2 - 4x - 3x + 3 = 4x(x - 1) - 3(x - 1) = (x - 1)(4x - 3)
c, = (x + 2)(5x - 4)
d, = 5x2 - 5x + 2x - 2 = 5x(x - 1) + 2(x - 1) = (x - 1)(5x + 2)
a) \(x^2-6x+8\)
\(=x^2-4x-2x+8\)
\(=x\left(x-4\right)-2\left(x-4\right)\)
\(=\left(x-4\right)\left(x-2\right)\)
b) \(4x^2-7x+3\)
\(=4x^2-4x-3x+3\)
\(=4x\left(x-1\right)-3\left(x-1\right)\)
\(=\left(x-1\right)\left(4x-3\right)\)
c) \(\left(3x-1\right)^2-\left(2x-3\right)^2\)
\(=9x^2-6x+1-\left(4x^2-12x+9\right)\)
\(=9x^2-6x+1-4x^2+12x-9\)
\(=5x^2+6x-8\)
\(=5x^2+10x-4x-8\)
\(=5x\left(x+2\right)-4\left(x+2\right)\)
\(=\left(x+2\right)\left(5x-4\right)\)
d) \(5x^2-3x-2\)
\(=5x^2-5x+2x-2\)
\(=5x\left(x-1\right)+2\left(x-1\right)\)
\(=\left(x-1\right)\left(5x+2\right)\)
Bài 1:
a: \(5x^3-x^2-5x+1\)
\(=x^2\left(5x-1\right)-\left(5x-1\right)\)
\(=\left(5x-1\right)\left(x-1\right)\left(x+1\right)\)
b: \(x^2+4xy+4y^2-9\)
\(=\left(x+2y\right)^2-9\)
\(=\left(x+2y+3\right)\left(x+2y-3\right)\)
c: \(x^2-5x+6=\left(x-2\right)\left(x-3\right)\)
\(\left(ax+by\right)^2-\left(ay+bx\right)^2\)
\(=\left(ax+by-ay-bx\right)\left(ax+by+ay+bx\right)\)
\(=\left(ax-ay-bx+by\right)\left(ax+ay+bx+by\right)\)
\(=\left[a\left(x-y\right)-b\left(x-y\right)\right]\left[a\left(x+y\right)+b\left(x+y\right)\right]\)
\(=\left(a-b\right)\left(x-y\right)\left(a+b\right)\left(x+y\right)\)
a) x2- y2-x2+2xy-y2= (x-y)(x+y)-(x-y)2= (x-y)(x+y-x+y)= 2y(x-y)
b) x6+x4+x2y2= x2(x3+x2+y2)
\(\left(ax+by\right)^2-\left(ay+bx\right)^2\)
(ax+ay+bx+by)(ax−ay+by−bx) \(=\left(ax+ay+bx+by\right)\left(ax-ay+by-bx\right)\)
\(=\left(a+b\right)\left(x+y\right)\left(a-b\right)\left(x-y\right)\)
\(\left(ax+by\right)^2-\left(ay+bx\right)^2=\left(ax+by-ay-bx\right)\left(ax+by+ay+bx\right)\)
\(=\left[a\left(x-y\right)-b\left(x-y\right)\right].\left[a\left(x+y\right)+b\left(x+y\right)\right]\)
\(=\left(a-b\right)\left(x-y\right)\left(a+b\right)\left(x+y\right)\)