The Quadratic Formula
(found on blackboard)
ax
2
+ bx + c = 0
x
2
+ (b/a) x + (c/a) = 0
x
2
+ (b/a) x + (b
2
/4a
2
) = (b
2
/4a
2
) - (c/a)
(x + (b/2a))
2
= (b
2
- 4ac)/4a
2
x = -(b/2a)
+
(b
2
- 4ac)
1/2
/(2a)
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PJ Brucat // University of Florida