Answer Key 7.1

$9+8b^2$
$x-5$
$5(9x^2-5)$
$1+2n^2$
$7(8-5p)$
$10(5x-8y)$
$7ab(1-5a)$
$9x^2y^2(3y^3-8x)$
$3a^2b(-1+2ab)$
$4x^3(2y^2+1)$
$5x^2(-1-x-3x^2)\text{ or }-5x^2(1+x+3x^2)$
$8n^5(-4n^4+4n+5)$
$4(7m^4+10m^3+2)$
$2x(-5x^3+10x+6)$
$5(6b^9+ab-3a^2)$
$3y^2(9y^5+4x+3)$
$-8a^2b(6b+7a+7a^3)$
$5(6m^6+3mn^2-5)$
$5x^3y^2z(4x^5z+3x^2+7y)$
$3(p+4q-5q^2r^2)$
$3(-6n^5+n^3-7n+1)$
$3a^2(10a^6+2a^3+9a+7)$
$-10x^{11}(4+2x-5x^2+5x^3)$
$4x^2(-6x^4-x^2+3x+1)$
$4mn(-8n^7+m^5+3n^3+4)$
$2y^7(-5+3y^3-2y^3x-4yx)$

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