Posted by Astri on Thursday, November 4, 2010 at 8:43am.
sqrt(ax^2 - b) = c,
sqrt(2x^2 - 7) = 5,
Square both sides:
2x^2 - 7 = 25,
2x^2 = 25 + 7,
2x^2 = 32,
x^2 = 32 /2 = 16,
Take sqrt of both sides and get:
x = +- 4.
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