Find $a$ such that $ax^2+15x+4$ is the square of a binomial

Step-by-step explanation:

Step-by-step explanation:

We want to find such that:

two same numbers, , multiply to be and

add up to be 15.

We can solve the last equation by dividing both sides by 2:

So this means can be rewritten as:

Divide both sides by 4:

So .

Let's check:

answer: the answer is d

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