Question

(4a+1)∧2-16a∧2(4a^2+1)^2-16a^2=(4a^2+4a+1)(4a^2-4a+1)怎么变成这样

Answer 1

(4a^2+1)^2-16a^2

=(4a^2+1)^2-(4a)^2

=[(4a^2+1)+4a][(4a^2+1)-4a]

=(4a^2+4a+1)(4a^2-4a+1)

=(2a+1)^2*(2a-1)^2