Tick (✓) the correct answer in each of the following:
(x+5)(x−3)=?
(a) x2+5x−15 (b) x2−3x−15 (c) x2+2x+15 (d) x2+2x−15
A quadratic polynomial whose zeros are 5 and −3, is
(a) x2+2x−15
(b) x2−2x+15
(c) x2−2x−15
(d) none of these