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Hi Megan - statistics, at least for me, was one of the hardest math subjects for me to make sense of. I hope that this can help...
Anytime we are dealing with the number of ways that things can combine, we are dealing with multiplication. For example, if I want to paint a house...

Karin is correct, above - the quadratic formula can be used to solve this equation. However, it's not the only way to do it. You could also use the "completing the square" method. Although I think the quadratic formula is easier, and it will absolutely
work for any quadratic equation...

This process will become very familiar as you progress into calculus, as it aids in defining the meaning of a derivative.
First, let's calculate f(a) by substituting a in for x:
f(a) = 14a2 - a + 7
Now...