Question

If x-3 is a factor of x^2-ax-15 ,then find the value of (a)

Answer 1

$\large{ \bold{f(x) = {x}^{2} - ax - 15}} \\ \\ \large{ \bold{given}} \\ \\ \large{ \bold{(x - 3) \: \: is \: a \: factor \: of \: f(x)}} \\ \\ = > \large{ \bold{f(3) = 0}} \\ \\ = > \large{ \bold{f(3) = {3}^{2} - 3a - 15}} \\ \\ = > \large{ \bold{ - 3a - 6 = 0}} \\ \\ = > \large{ \bold{a = - 2}} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \color{blue}{\boxed{\large{ \bold{hope \: it \: helps}}}}$

Answer 2

Step-by-step explanation:

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