Question 177978
Factor 15 + 3y – 5x^2 – x^2y 
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Rearrange to get:
15 - 5x^2 + 3y - x^2y
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Factor to get:
5(3-x^2) + y(3 - x^2)

(3-x^2)(5+y)
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Cheers,
Stan H.