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15-06-2018
Mathematics

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Use FOIL to solve this equation:

[tex]5x^{2} -10= x^{2} +90[/tex]

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altavistard altavistard

15-06-2018

FOIL is not for solving equations; it's for expanding the products of binomials.

5x^2 - 10 = x^2 + 90 becomes 4x^2 = 100, or x^2 = 25, so that x = plus or minus 5.

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