Find the vertex of the following equations.
a) (x-4)2 + 12
b) (x + 5)2 – 20

step-by-step explanation:

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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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