if -5 is a root of the quadratic equation 2xsquare +px -15 =0 , then p = ??
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If - 5 is root.
x = -5
Put value of x in equation
=> 2 × (-5)^2 + p × (-5) - 15 =0
=> 2 × 25 - 5p - 15 = 0
=> 50 - 15 - 5p = 0
=> 35 - 5p = 0
=> 35 = 5p
=> 35/5 = p
=> p = 7
p is 7
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