Question

Find the answer by the suitable identity (2x+5y)^2-(3x-4y)^2​

Answer 1

${(2x + 5y)}^{2} - {(3x - 4y)}^{2} \\ = (2x + 5y + 3x - 4y)(2x + 5y - 3x + 4y) \\ = (5x + y)( 9y - x)$