Answer:
multiplication
Step-by-step explanation:
I'm assuming that you are given the equation f(x) = 2x^2 + 3 and the value f(-3).
To find this, all you need to do is plug in the value of -3 in f(x) for all x values. It would look like:
![f(x) = 2(-3)^{2} + 3](https://tex.z-dn.net/?f=f%28x%29%20%3D%202%28-3%29%5E%7B2%7D%20%20%2B%203)
All you need to do is simplify:
![f(x) = 2(9) + 3](https://tex.z-dn.net/?f=f%28x%29%20%3D%202%289%29%20%2B%203)
![f(x) = 18 + 3](https://tex.z-dn.net/?f=f%28x%29%20%3D%2018%20%2B%203)
![f(x) = 21](https://tex.z-dn.net/?f=f%28x%29%20%3D%2021)
Your final answer is f(x) = 21.
An obtuse triangle would be formed. If you add all the angles, you get a total of more then 180 causing it to b obtuse.