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2) n²+n-42 = (n+7) (n-6)
3) m⁴ +m²n²+n⁴ = (m²+n²)²-(mn)² = (m²+mn+n²) (m²-mn+n²)
4) 15x⁴-15x³+20x² = 5x²(3x²-3x+4)
5) x³+6x²y+12xy²+8y³
x³+8y³+6x²y+12xy²
x³+(2y)³+6xy(x+2y)
(x+2y)(x²-2xy+4y²)+6xy(x+2y)
(x+2y)(x²-2xy+4y²+6xy)
(x+2y)(x²+4xy+4y²)
(x+2y)(x+2y)²
(x+2y)³
6) 81x²-(a+x)² = (9x+a+x)(9x-a-x) = (10x+a)(8x-a)
7) a⁴+3a²b-40b² = (a²+8b) (a²-5b)
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