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If one root of the equation 2x2 + 3x – k = 0 is 6, what is the value of k ?
Solution
Substituting 6 in the quadratic equation we get2(6)2 + 3(6) − k = 072 + 18 − k = 0Therefore, k = 90
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If n is a root of quadratic equation ax2 + bx + c = 0Then, an2 + bn + c = 0
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