Question

One zero of the quadratic polynomial 8x2-18x-m is5/2, find the value of m

Answer 1

Sum of zero = -b/a

let the second zero be p

(5/2)+p=-(-8)/2

=4

p=4-(5/2)

p=3/2

so the second root is 3/2

product of root =c/a

so (5/2)(3/2)=-m/2

m=-15/2

hope it helps