TrequanThaDon TrequanThaDon

17-08-2017
Mathematics

contestada

When factored, the trinomials x^2-2x-15 and x^2-9x+20 have one binomial factor in common. What is this factor?
1. x-7
2. x+7
3. x-5
4. x+5

Respuesta :

kphung76127 kphung76127

17-08-2017

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

Proof:
-5+3=-2
-5*3=-15

x^2-9x+20
(x-4)(x-5)

Proof:
-4-5=-9
-4*-5=20

Final answer: (x-5)

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