SOLUTION: {{{y^2 + 8y = 2}}} I have tried this problem a number of times and i never get the right combination let alone the right numbers. The answers available are: a) -8.2,0.2 b)8.2,-0

Question 37633: I have tried this problem a number of times and i never get the right combination let alone the right numbers. The answers available are: a) -8.2,0.2 b)8.2,-0.2 c)0.3,7.7 d)-7.7,-0.3. The only numbers I get are 0.2, 0.3, and 0.4, which is not one of the numbers. Please help!
Answer by Nate(3500) (Show Source): You can put this solution on YOUR website!

Use quadratic fomula:

Answer is B

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=72 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 0.242640687119285, -8.24264068711928. Here's your graph:

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