Question 86672
Given:
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{{{sqrt(144) + 3(8+7(2-3))= y}}}
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Find y
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First you can do {{{sqrt(144) = 12}}}. Substitute this and the equation becomes:
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{{{12 + 3(8+7(2-3)) = y}}}
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Now start with the most nested (the interior) set of parentheses.  These are the parentheses
that contain 2 - 3.  Since 2 - 3 = -1 we can substitute this and the equation becomes:
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{{{12 + 3(8+7(-1)) = y}}}
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Then multiply 7 times the -1 and get -7. Substitute -7 for 7(-1) and the equation then
becomes:
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{{{12 + 3(8 - 7) = y}}}
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Then subtract 7 from 8 to get +1. Substitute +1 for the parentheses and you have:
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{{{12 + 3(+1) = y}}}
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Multiply 3 times +1 and the equation is reduced to:
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{{{12 + 3 = y}}}
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and the answer (y) is equal to 12 + 3 and this is +15
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Hope this explains where the answer came from.