Question

if and b are the zeroes of the quadratic polynomial f(x)=2x^2+5x+k such that a^2+b^2+ab=21/4, find the value of k​

Answer 1

Answer:

this is your answers bro or sis .

I had use the identity in 3rd step

(a+b)²=a²+b²+2ab

a²+b²=(a+b)²-2ab