Wednesday 12 March 2014

PERFECT SQUARES C1

If 4x2 + nx + 9 is a perfect square, find n

Solution

a = 16, b = n, c = 9.

b2 = 4ac

(n)2 = 4 x 4 x 9

n2 = 144  (Find the square root of 144)

n = 12  


Hence n = 12


TRY THIS....

If 49x2 - nx + 4 is a perfect square, find n

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