Question

a) 2x²y - 6xy²

b) 3x . (x - 1)+ 7x². (x - 1)

c) 3x . (x - a) + 5a.(a - x)

d) x² - 6xy + 9y² 

e) 125x³ + y⁶ 

f) 5xy² - 10xyz + 5xz²

 g) x² - 2xy + y² - x² + yz

h) x² - x - 6

i) x⁴ + 4x² + 5 

Answer 1

a.2x²y-6xy²

=2xy(x-3y)

b.3x(x-1)+7x²(x-1)

=(x-1)(3x+7x²)

c.3x(x-a)+5a(a-x)

=3x(x-a)-5a(x-a)

=(x-a)(3x-5a)

d.x²+6xy+y²

=(x-y)²

e.125x³+y⁶

=(5x)³+(y²)³

=(5x+y²)(10x²-5xy+y⁴)

f.5x²y-10xyz+5xz²

=5x(y²-2yz+z²)

=5x(y-z)²

g.x²-2xy+y²-x²+yz

=(x-y)²-x²+yz

=(x-y-x)(x-y+x)+yz

h.x²-x-6

=(x²)-2x-3x-6

=x(x-2)-3(x-2)

=(x-2)(x-3)

i.x⁴+4x²+5

=(x²)²+4x²+5

=(x²)²+4x²+2-2+5

=(x²+2)²-3

Answer 2

nhung bai nay de lam bn cu thay thua so chung la nhom thui, bn xem mk lam rui lam tip nhe

a) = 2xy(x - 3y)

b) = (x-1)(3x+7x²) = x(3+7x)(x-1)

c) = (x-a)(3x-5a)       bn đổi + 5a(a-x) = -5a(x-a)

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