Thursday 19 December 2013

QUADRATIC A4

If Fx2 + 20x + 25 is a perfect square, find f

Solution

a = f, b = 20, c = 25.

b2 = 4ac

(20)2 = 4 x f x 25

400 = 100f  (Divide by 100 on both sides)

f = 4    


Hence f= 4

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