Question

(b-5/2b)x(b^2+3b/b-5)

Answer 1

$\frac{b - 5}{2b} \times \frac{ {b}^{2} + 3b }{b - 5} = \frac{ {b}^{2} + 3b}{2b}$
Cancelled (b-5)

Cancel 'b'
$\frac{ {b}^{2} + 3b}{2b} = \frac{b(b + 3)}{2b} = \frac{b + 3}{2}$