SOLUTION: what is 5p^2=-8+22p

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Question 419382: what is 5p^2=-8+22p
Answer by duckness73(47) About Me  (Show Source):
You can put this solution on YOUR website!
Starting with the original equation:
5p%5E2=-8%2B22p
Let's get all of the terms on one side of the equation:
5p%5E2+-+22p+%2B+8+=+0
Then factoring we have:
(5p - 2)(p - 4) = 0
Solving each factor individually, we have:
5p - 2 = 0 gives p = 2/5
p - 4 = 0 gives p = 4
Solution: p = 2/5 or p = 4
Let's check the answers:
For p = 2/5 we have:
5+%28%282%2F5%29%5E2%29+=+-8+%2B+22%282%2F5%29
5 (4/25) = -8 + (44/5)
20/25 = -40/5 + 44/5 (need a common denominator in order to add the fraction)
20/25 = 4/5
4/5 = 4/5 (reducing the fraction on the left side of the equation)
So, p = 2/5 checks out
For p = 4 we have:
5+%28%284%5E2%29%29+=+-8+%2B+%2822+%284%29%29
5 * 16 = -8 + 88
80 = 80
So, p = 4 checks out