Question

If -5 is the root quadratic equation of 2x2+px-15=0,then find the value of p?

Answer 1

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Answer 2

Answer:

$p(x) = {2x}^{2} + px - 15 = 0$

$p( - 5) = 2 { (- 5)}^{2} - 5p - 15 = 0$

$50 - 5p - 15 = 0$

$35 - 5p = 0$

$- 5p = - 35$

$p = 7$

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