Question

(1 + 2b) ∙ b/2 − 2 − b/ 2 =

Answer 1

(1+2b)*b/2 - 2 - b/2=
=b/2+2b^2/2 - 2 - b/2=
=b/2+b^2 - 2 - b/2=
=b^2-2
b^2= b²