Posted by **Astri** on Thursday, November 4, 2010 at 8:43am.

If √ax²-b=c and a=2, b=7, and e=5, find X

- Math -
**Henry**, Friday, November 5, 2010 at 6:44pm
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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