Question

12r^2+13r-35

Answer 1

12r^2+13r-35



12r^2-15r+28r-35



(12r^2-15r)+(28r-35)



3r(4r-5)+(28r-35)



3r(4r-5)+7(4r-5)



(3r+7)(4r-5)



So 12r^2+13r-35 factors to (3r+7)(4r-5)



In other words, 12r^2+13r-35=(3r+7)(4r-5)

Answer 2

(3r+7)(4r-5)

Answer 3

note: 12*-35 = -420

and the two numbers -15 and 28 both multiply to -420 and add to 13

Answer 4

see i started out with 6 and 2 but when i did the foil it wasnt right

Answer 5

ah I see, but you've got to include the last number (which is why you multiply -12 and 35)

Answer 6

then i re-did it and fount the correct anwer

Answer 7

*multiply 12 and -35

Answer 8

that's great