algebra

Two questions actually. Please only respond with step-by-step answers. Feel free to change the numbers, I just need to know how to do it...
1.) Factor Completely:
4a^2 + 81 - 36a

2.) In a right triangle, find the length of the side not given. b= 2 c= sqrt. 13

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  1. 1.) 4a^2 -36a + 81

    What are factors of 81? (3 * 3 * 3 * 3)
    What are factors of 4? (2 * 2)
    What combination of these factors (or the whole number) can give you -36 for the middle term?

    2.) Pythagorean theorem

    a^2 + b^2 = c^2

    a^2 + 4 = 13

    Can you work it from here?

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