Question

Factorise 9a^2 -4b^2 +6b +4a +20

Answer 1

${9a}^{2} - {4b}^{2} + 6b + 4a + 20 \\ \\ \\( {9a}^{2} - {4b}^{2} ) + (6b + 4a + 20 ) \\ \\ [(3a + 2b)(3a - 2b)] + [2(3b + 2a + 10)]$