Question
If both the roots of x 2 Â + kx + 49 = 0 are
real and equal, then find the value of 'k'.Solution
If both the roots of equation ax 2 Â + bx + c = 0 are real and equal, then b 2 Â - 4ac = 0.
So, k 2 Â - 4 X 49 = 0
Or, k 2 Â = 196
Or, 'k' = +14, - 14
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