Question

Find the value of k if -2 is a root of the quadratic polynomial kx2+x-10=0

Answer 1

given: kx²+x-10=0,  

since -2 is a root, x = -2 is what it means.

therefore,

         k(-2)² + (-2) -10 = 0

         4k-12=0

         4k=12

          k=3