Posted by David on Wednesday, December 12, 2012 at 2:58pm.
Solve using the quadratic formula
X^24x=21

Math Help now !!!! Plz  drwls, Wednesday, December 12, 2012 at 5:34pm
Learn the quadratic formula:
x = [b +/sqrt(b^2 4ac)]/2a
In your case a = 1, b = 4 and c = 21
x = [4 +/sqrt(100)]/2
You finish it. You surely know what the square root of 100 is.
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