Respuesta :

wegnerkolmp2741o

x² – 8x + 15

(x-3) (x-5)


what two numbers multiply to 15 and add to -8

I list all the factor of 15 that are negative and see if they add to -8

-1 * -15  = 15      -1 + -15 = -16   no

-3 * -5  = 15      -3 + -5 = -8  works

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