Question

If one zero of the quadratic polynomial x^2 + 3x + k is 2 then the value of k is

Answer 1

Answer:

${x}^{2} + 3x + k \\ \\ {2}^{2} + 3(2) + k = 0 \\ \\ 4 + 6 + k = 0 \\ \\ 10 + k = 0 \\ \\ therefore \\ k = - 10$