4(a+b)²-a²+2ab-b² factories it@#@$@$$
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4(a+b)²-a²+2ab-b²
= 4( a ²+2ab+ b ²) - a²+2ab-b²
=4a ²+8ab +4b ² - a²+2ab-b²
= 3 a² +10ab + 3 b²
= 3 a² +9ab +ab + 3 b²
=3a(a+3b) +b(a+3b)
=(3a+b)(a+3b)
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