Multiply Polynomials

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Multiply $(9x-1)(7x+1)$

**Answer**

$\;\;\; (9x-1)(7x+1)$

$=9x(7x+1)-1(7x+1)$

$=63x^{2}+9x-7x-1$

$=(63x^{2})+(9x-7x)+(-1)$

$=63x^{2}+2x-1$