1 year ago

(5x+28) (7x+4) find the value of x

Mathematics

1 answer:

Ilia_Sergeevich [38]1 year ago

7 0

Answer:

given p(x)= 5x^3-7x^2-ax-28

(x-4) is a factor of 5x^3-7x^2-ax-28

=>p(4)=0

=>5(4)^3-7(4)^2-4a-28=0

=>320-112-4a-28=0

=>-4a=-180

=>a=180/4

=>a=45

Step-by-step explanation:

x=a

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