Question

please solve this sum​

Answer 1

$\binom{12( {b}^{2} + 8b + 15) }{3(b + 5)} = \binom{( {b}^{2} + 8b + 15)}{b + 5} \\ b + 3\\ b + 5 \sqrt{ {b}^{2} + 8b + 15 } \\ - ({b}^{2} + 5b) \\ 3b + 15 \\ - (3b + 15) \\ 0$