Question

If - 4 is the root of quadratic equation x²+ px -4
and 2x² + px + k of has equal reato find k.
class 10 quadratic equations answer plz​

Answer 1

Answer:

x= -4

x^2+px -4 = 2x^2 + px +k

putting value of x in the equation

(-4)^2 + p(-4) -4 = 2(-4)^2 + p(-4) +k

16 -4p -4 = 2(16) -4p +k

12-4p = 32 - 4p + k

12- 4p +4p -32 = k

-20 = k

So, the value of k is - 20