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OpenStudy (anonymous):
K = (b – 2a) for b.
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OpenStudy (aroub):
b=2a+k
OpenStudy (anonymous):
thanks! but how did yu get that?
OpenStudy (aroub):
You want 'b' right? So, just add 2a to both sides
OpenStudy (anonymous):
yes! ok thanks
OpenStudy (aroub):
Np!
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Directrix (directrix):
K = (b – 2a) for b. k = b - 2a k + 2a = b -2a + 2a k + 2a = b b = k + 2a
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