Question

Phân tích đa thức thành nhân tử

x^2 + 2x -15

 

Answer 1

\(x^2+2x-15\)

\(=x^2+5x-3x-15\)

\(=x\left(x+5\right)-3\left(x+5\right)\)

\(=\left(x+5\right)\left(x-3\right)\)

Answer 2

x² + 2x - 15

= x² + 5x - 3x - 15

= x.(x+5) - 3.(x+5)

= (x+5).(x-3)

Answer 3

x^2+2x-15=x^2+5x-3x-15

=x(x+5)-3(x+5)=(x-3)(x+5)

Answer 4

\(x^2+2x-15\)

\(=x^2+5x-3x-15\)

\(=x\left(x+5\right)-3\left(x+5\right)\)

\(=\left(x-3\right)\left(x+5\right)\)

Answer 5

x²  +2x - 15

= x² - 3x + 5x -15

= x .( x - 3 ) + ( x - 3 )

= ( x + 5 ).( x - 3 )