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Help please very easy to smart ppl thank u so much x

Help please very easy to smart ppl thank u so much x-example-1
User AlexQueue
by
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1 Answer

4 votes

Answer:

x =
√(7) is a solution

Explanation:

(x² - 7)² + 2x² - 14 = 0 ← factor out 2 from last 2 terms

(x² - 7)² + 2(x² - 7) = 0 ← factor out (x² - 7) from each term

(x² - 7)(x² - 7 + 2) = 0

(x² - 7)(x² - 5) = 0

equate each factor to zero and solve for x

x² - 7 = 0 ( add 7 to both sides )

x² = 7 ( take square root of both sides )

x = ±
√(7)

x² - 5 = 0 ( add 5 to both sides )

x² = 5 ( take square root of both sides )

x = ±
√(5)

solutions are x = -
√(7) ,
√(7) , -
√(5) ,
√(5)

User Kukic Vladimir
by
7.7k points

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