Question

phân tích da thức thành nhân tử

a. 4 - 3x - x²

b.. 8 - x -7x²

c. x² - 10x + 16

Answer 1

c) \(x^2-10x+16=x^2-2x-8x+16=x\cdot\left(x-2\right)-8\cdot\left(x-2\right)=\left(x-8\right)\cdot\left(x-2\right)\)

Answer 2

a) = 4 + x - 4x - x²

^{= ( 4 + x) - ( 4x + x^2)}

^{= (4+x)-x(4+x)}

^{= (4+x)(1-x)}

Answer 3

a: \(=-\left(x^2+3x-4\right)=-\left(x+4\right)\left(x-1\right)\)

b: \(=-\left(7x^2+x-8\right)\)

\(=-\left(7x^2+8x-7x-8\right)\)

\(=-\left(7x+8\right)\left(x-1\right)\)

c: =(x-2)(x-8)