SOLUTION: if f(x)=x^2-7x find f (a-4)

Question 836607: if f(x)=x^2-7x find f (a-4)
Answer by doodles(24) (Show Source): You can put this solution on YOUR website!
Basically you insert (a-4) into x so....
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Then we solve the quadratic equation:

Solved by pluggable solver: SOLVE quadratic equation with variable

Quadratic equation (in our case ) has the following solutons:

For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

Discriminant d=1 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 4, 3. Here's your graph:

Ultimately, the answer is 4 and 3.
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