SOLUTION: solve each inquality. state the solution set using interval notation and graph it. problem is: a^2 + 2a greater and equal to 15

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Question 58482This question is from textbook elementary and intermediate algebra
: solve each inquality. state the solution set using interval notation and graph it.
problem is: a^2 + 2a greater and equal to 15 This question is from textbook elementary and intermediate algebra

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
A^2+2A>=15
A^2+2A-15=0
(A+5)(A-3)=0
A+5=0
A=-5
AND
A-3=0
A=3
PROOF
-5*-5+2*-5>=15
15-10>=15
15=15
AND
3*3+2*3>=15
9+6>=15
15=15