Simplify: (3x2 - 4xy + 7y2) – (7x2 - 6xy – 3y? )
0-4x2 – 10xy – 10y?
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o-4x2 - 2xy + 10y2
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0-4x2 - 10xy + 10y2
-4x? + 2xy + 10y2

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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step-by-step explanation: