Question

Find the product of (4x + 5) (4x -1) using appropriate identity.​

Answer 1

Answer:

$(4x + 5)(4x - 1) \\ 4x(4x - 1) + 5(4x - 1) \\ 16 {x}^{2} - 4x + 20x - 5 = \\ 16 {x}^{2} + 16x - 5.$