17-03-2020
Mathematics

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The difference of the square of a number and 28 is equal to 3 times that number. Find the negative solution

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17-03-2020

If the number is x, this can be written as

x² - 28 = 3x

Move the 3x

x² - 3x - 28 = 0

Factor

(x - 7)(x + 4) = 0

This means that x can be 7 or -4, so it's x = -4

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