9. let f(x) = x2 + 3x - 4 and g(x) = x + 5. find f(x) · g(x). (1 point)
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x3 + 3x2 + 16x - 20
x3 + 5x2 + 14x – 20
x3 + 8x2 + 11x - 20
x3 + 9x2 + 19x – 20

Hey there! My name is Maggie and I’m here to help you with your homework!
This is a polynomial exercise and it’s objective is to use the distributive propriety. In theory, it means to multiply every factor in the first polynomial by the other one.

X^2 . X = x^3
X^2 . 5 = 5x^2
3X . X = 3x^2
3X . 5 = 15x
-4 . X = -4x
-4 . 5 = -20

Now remember to add every term that has X’s with the same exponents.
So, we add 5x^2 and 3x^2 and we get 8x^2.
We do the same with 15x + (-4x) = 11x
And the answer is:

x^3+8x^2+11x-20.

I hope You’ll find my answer helpful.
Have a nice day!

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

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