Question

Factor9x}^{2} - {25y}^{2} " alt=" {9x}^{2} - {25y}^{2} " align="absmiddle" class="latex-formula">

Answer 1

$\text{Use}\ (a-b)(a+b)=a^2-b^2\\\\9x^2-25y^2=(3x)^2-(5y)^2=(3x-5y)(3x+5y)$