SOLUTION: Solve y2 = 15y − 56 using the quadratic formula

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Question 522808: Solve y2 = 15y − 56 using the quadratic formula

Answer by Maths68(1474)   (Show Source): You can put this solution on YOUR website!
y^2=15y-56
y^2-15y+56=0
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: 8, 7. Here's your graph:
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