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Mathematics

Find x, if log7 (2x2 - 1) = 2

Logarithms

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Answer

Given,

⇒ log7 (2x2 - 1) = 2

⇒ 2x2 - 1 = 72

⇒ 2x2 - 1 = 49

⇒ 2x2 = 49 + 1

⇒ 2x2 = 50

⇒ x2 = 502\dfrac{50}{2}

⇒ x2 = 25

⇒ x = 25=±5\sqrt{25} = \pm 5.

Hence, x = ±5\pm 5.

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