Question

simplify : ( 2a - 1 ) ( 2a - 1 ) ( 4a squared +1 )

Answer 1

${x}^{2} - {y}^{2} = (x + y)(x - y)$
HENCE
$(2a - 1)(2a + 1)(4 {a}^{2} + 1) \\ = ( {4a}^{2} - 1)(4 {a}^{2} + 1) \\ = {16a - 1}^{2}$