Use FOIL to solve this equation: 5x^(2) -10= x^(2) +90

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asked Aug 15, 2019 95.6k views

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Clambake · Answer 1 · 2019-08-22T05:29:25+0000

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.

Use FOIL to solve this equation: 5x^(2) -10= x^(2) +90

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