If-5 is root of quadratic equation …
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Naveen Sharma 7 years, 3 months ago
as -5 is root of equation 2x2+2px-15=0
then it ll satisfy this equation, Put x = -1
2(-5)2 + 2p(-5) - 15 = 0
=> 50 - 10p -15 = 0
=> 35 = 10p
p = 3.5
And it is given that eq. p(x2+x) + k = 0 have equal roots.
px2+px + k = 0
3.5x2+3.5x + k = 0
a = 3.5, b = 3.5, c = k
so d = 0
(3.5)2 - 4 (3.5)k = 0
=> 14 k = 12.25
k = 3.0625
2Thank You