Question

(4x+1)(4x+5) find it using (x+a)(x+b)=x(square)+(a+b)+ab

Answer 1

(4x+1)(4x+5)

Using the identity (x+a) (x+b) = x² + (a+b)x + ab

=> (4x)² + (1+5)4x + 5

=> 16x² + 24x + 5

Now solve the equation