Question

(2a^2+9)(2a^a+5)
Using identity

Answer 1

$we \: know \\ (x + a)(x+ b) = x {}^{2} + (a + b)x + ab$

considering the above identity,

$(2a {}^{2} + 9)(2a {}^{2} + 5) \\ > (2a {}^{2}) {}^{2} + (9 + 5)2a {}^{2} + (9 \times 5) \\ > 4a {}^{2} + (14 \times 2a {}^{2} ) + 45 \\ > 4a {}^{2} + 28a {}^{2} + 45$

hope this helps

wish you best lucks