What is standard form for 300,000+40,000+60+7

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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answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.