Question

Phân tích đa thức thành nhân tử

a) 7x – 14

b) 5x3 - 10x2y +5xy2

c) 25 – x2

Answer 1

a) 7x – 14 = 7(x - 2)

b) 5x3 - 10x2y +5xy2 = 5x(x² - 2xy - y²) = 5x(x - y)²

c) 25 – x2= (x - 5)(x + 5)

Answer 2

a, \(7\left(x-2\right)\)

c, \(\left(5-x\right)\left(5+x\right)\)

Answer 3

 \(a,7x-14=7\left(x-2\right)\\ b.5x^3-10x^2y+5xy^2=5x\left(x^2-2xy+y^2\right)=5x\left(x-y\right)^2\\ c,25-x^2=\left(5-x\right)\left(5+x\right)\)

Answer 4

a)\(7x-14=7\left(x-2\right)\)

b)\(5x^3-10x^2y+5xy^2=5x\left(x^2-2xy+y^2\right)=5x\left(x-y\right)^2\)

c)\(25-x^2=5^2-x^2=\left(5-x\right)\left(5+x\right)\)