What are the real zeros of x^3+4x^2-9x-36

Step-by-step explanation:

To find the real zeros you must match the function to zero and factor the expression.

We have a polynomial of degree 3.

We try to group the terms to perform the factorization

Now we take (x + 4) as a common factor

If we have an expression of the form we know that this expression is equivalent to:

In this case

So:

Finally:

The solutions are:

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a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.