Question

9-4x 2-48xy-144y2
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Answer 1

$9-4x^2-48xy-144y^2=3^2-(2x+12y)^2= \\ \\ (3+2x+12y)(3-2x-12y)$

Answer 2

9-4x²-48xy-144y²=9-(4x²+48xy+144y²)=9-(2x+12y)²=(3-(2x+12y))*(3+(2x+12y))=(3-2x-12y)*(3+2x+12y)