1)
[tex]3x {}^{4} - 15x + 264x[/tex]
[tex]15a {}^{2} + 21ab - 25ab - 35b {}^{2} = - 20a {}^{2} - 4ab[/tex]
[tex]y {}^{3} + y {}^{2} - 7y + 4y {}^{2} + 4y - 28 = y {}^{3} + 5y {}^{2} - 3y - 28[/tex]
2)
[tex]7x {}^{3} - 42x {}^{6} = 7x {}^{3} (1 - 6x {}^{2} )[/tex]
[tex]8a - 8b + ax - bx = 8(a - b) + x(a - b)=(a - b)(8+x)[/tex]
[tex]6mn - 3m + 2n - 1 = 3m(2n - 1) + 2n + 1 = (2n + 1)(3m + 1)[/tex]
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Answers & Comments
1)
[tex]3x {}^{4} - 15x + 264x[/tex]
[tex]15a {}^{2} + 21ab - 25ab - 35b {}^{2} = - 20a {}^{2} - 4ab[/tex]
[tex]y {}^{3} + y {}^{2} - 7y + 4y {}^{2} + 4y - 28 = y {}^{3} + 5y {}^{2} - 3y - 28[/tex]
2)
[tex]7x {}^{3} - 42x {}^{6} = 7x {}^{3} (1 - 6x {}^{2} )[/tex]
[tex]8a - 8b + ax - bx = 8(a - b) + x(a - b)=(a - b)(8+x)[/tex]
[tex]6mn - 3m + 2n - 1 = 3m(2n - 1) + 2n + 1 = (2n + 1)(3m + 1)[/tex]