Find the value of a such that x-4 ia a factor of 5xcube -7xsquare -ax -28
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x=4
f(x)=5x^3-7x^2-ax-28
5(4)^3-7(4)^2-4a-28=0
320-112-28=4a
4a=180
a=45
pls mark it as brainlist
f(x)=5x^3-7x^2-ax-28
5(4)^3-7(4)^2-4a-28=0
320-112-28=4a
4a=180
a=45
pls mark it as brainlist
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