Question 47

If $$3x^2+ax+4$$ is perfectly divisible by $$x-5$$, then the value of $$a$$ is:

Solution

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x - 5 will be a factor of the given expression which means that f(5) = 0.
$$3\left(5\right)^2+5a+4=0$$
$$5a=-79$$
a = -15.8.

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