Question

factorise 9xsq+6x+1-25ysq

Answer 1

Here is your answer
$9x {}^{2} + 6x + 1 - 25y {}^{2} \\ (3x) {}^{2} - (5y) {}^{2} + 6x + 1 \\ (3x + 5y)(3x - 5y) + 6x + 1$
Hope it helps you