Question

prove that 9xsquare+30x+28 has no zeroes

Answer 1

9x² + 30x + 28

D = b²-4ac
    = 30² - 4*9*28
    = 900 - 1008
    = -108

D = -108 < 0 

Hence, Given Eqn has no real roots

Answer 2

$9x {}^{2} + 30x + 28 = 0$
it has no zeros becoz it cannot be splited
I.e, the middle term cannot be splitted