12. If 4x² – 6x – m is divisible by x – 3, the value of m is exact divisor of (a) 9(b) 45(c) 20(d) 3613. If one zero of the polynomial x² -6 x+ 4 is 3 + √5, write the other zero.14. If one factor of x3 + 7kx² – 4kx + 12 is (x + 3), Find the value of k.15. If x3 + x² – ax + b is divisible by x² – x, write the values of a and b.16. If the zeroes of the quadratic polynomial x² + (a + 1) x + b are 2 and -3, then [NCERT Exemplar Problem, CBSE 2011](a) a = -7, b = -1(b) a = 5, b = -1(c) a = 2, b = -6(d) a = 0, b = -617. The zeroes of the quadratic polynomial ax² – b are (a) both negative(b) one positive and one negative(c) both positive(d) both equal18. The zeroes of the quadratic polynomial p² – qx + r are(a) both negative(b) one positive and one negative(c) both positive and unequal(d) both equal and positive19. If one of the zeroes of the cubic polynomial x3 + ax² + bx + c is -1, then the product of theother two zeroes is(a) b – a + 1(b) b – a – 1(c) a – b + 1(d) a – b – 120. What is the sum of zeroes of quadratic polynomial p(x) = ax (p + x) + b has/have:(a) p/a(b) a/p(c) 1/p(d) -p​