SOLUTION: i need help solving for a a^2+4a=45

Question 67900: i need help solving for a
a^2+4a=45
Found 2 solutions by Earlsdon, Zoop:
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Solve for a:
Subtract 45 from both sides.
Solve this quadratic equation by factoring:
Apply the zero product principle.
and/or
If then
If then
The solutions:
a = 5
a = -9
Answer by Zoop(21) (Show Source): You can put this solution on YOUR website!
Equation:
Steps:
1. Make it a trinomial and move the 45 over.

2. Factor it.
To factor this, find two factors of 45 that add to get 4a.
Those factors would be 9 and -5.
So, factored, it would be:

3. Find the solutions.
When finding the solution of an equation like this, perform the same steps you use to find restrictions.
E.g. set each monomial to equal 0.
AND
Solve each mini-equation.
The solutions are -9 and +5.
Try it out:

Yup.
How about:

Yup.
So your solution set is:
{-9,5}.
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