a. (a) Explain why multiplying the quadratic polynomial (x−2)(x+5) by any non-zero constant k does not change its zeros.
(b) Write the polynomial obtained when k=7.
a. (a) Explain why multiplying the quadratic polynomial (x−2)(x+5) by any non-zero constant k does not change its zeros.
(b) Write the polynomial obtained when k=7.