Write the correct answer of the following
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Equation: 4x² + kx + 9
On comparing,
a = 4 ; b = k ; c = 9
For Real and equal roots:
Descreminant, D = 0
==> D = 0
==> b² - 4ac = 0
==> k² - 4×9×4 = 0
==> k² = 144
==> k = ± 12
Hence, For k = 12 or k = -12 , Following equation will have real and equal roots.
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