Respuesta :

x² + 4x + 5x + 20

We can group this equation into two terms:

x² + 4x and 5x + 20

The greatest common factor of x² + 4x is x, and the gfc of 5x + 20 is 5, then:

x² + 4x = x(x + 4)

5x + 20 = 5(x + 4)

Replacing into the original expression,

x² + 4x + 5x + 20 =

= x(x + 4) + 5(x + 4) =

Taking (x + 4) as the gcf,

= (x + 4)(x + 5)

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