Saturday 11 April 2015

PERFECT SQUARES 1




If Fx2 - 30x + 25 is a perfect square, find f

Solution

a = f, b = 30, c = 25.

b2 = 4ac

(-30)2 = 4 x f x 25

900 = 100f   (since -30 x -30 = +900)

900 = 100(Divide by 100 on both sides)
100 = 100 
f = 9   


Hence f= 9

TRY THIS.........................................

If Fx2 -20x + 4 is a perfect square, find f

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