Question 229561
Multiply: 
(6z-7t+1)(6z+5t-7)
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= 6z(6z+5t-7)-7t(6z+5t-7)+(6z+5t-7)
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= 36z^2+30zt-42z-42zt-35t^2+49t+6z+5t-7
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= 36z^2-12zt-38z+5t-35t^1-7
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Cheers,
Stan H.