Question

phân tích thành nhân tử :

x² +7x - 8

Answer 1

\(\Rightarrow x^2+7x-8=x^2-x+8x-8\)

\(\Rightarrow x.\left(x-1\right)+8.\left(x-1\right)\)

\(\Rightarrow\left(x-1\right).\left(x+8\right)\)

Answer 2

= (x-1)(x+8)

Answer 3

x² + 7x - 8

= x² - x + 8x - 8

= x(x - 1) + 8(x - 1)

= (x + 8)(x - 1)