Question

Factories 4x^2 -9y^2 +20x+1

Answer 1

$4 {x}^{2} - 9 {y}^{2} + 20x + 1 \\ (2 {x})^{2} - (3 {y})^{2} + 20x + 1 \\ (2x + 3y)(2x - 3y) + 20x + 1$
This the answer.
It is a very tough sum!!