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Evaluate: 9x^2-18x-7
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Number Theory
Evaluate: 9x^2-18x-7
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Calculus
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Expression: $9x^{2}-18x-7$
Break the expression into groups
$=(9x^{2}+3x)+(-21x-7)$
Factor out common term $3x+1$
$=(3x+1)(3x-7)$
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