Thursday

September 18, 2014

September 18, 2014

Posted by **Knights** on Wednesday, December 19, 2012 at 12:29pm.

x^2 =40+12sqrt2

what would be x? BTW if you sqrt both sides it would be double square root so what then? how to simplify?

- double square root problem? -
**Damon**, Wednesday, December 19, 2012 at 2:30pm12 sqrt 2 = x^2 - 40

144 (2) = x^4 -80 x^2 + 1600

x^4 - 80 x^2 + 1312 = 0

graph to find zeros

http://mathportal.org/calculators/polynomials-solvers/polynomial-graphing-calculator.php

zeros at

x = -7.55, -4.80 + 4.80, +7.55

check those in original

+ and - 7.55 works

the 4.8 does not

**Answer this Question**

**Related Questions**

algebra - simplify: square root of 5 + square root of 20 - square root of 27 + ...

radical equation - 2^x+20=15+3^x A)1 B)16 C)-5 D)25 I chose c but i got it wrong...

Math - I can not find the solutions to the following problems using 2 methods: ...

math - determine the area of triangle abc when side ab= square root of x, side ...

algebra 2 - Not sure if either one of these answer are correct to simplify the ...

math - thanks for the help but i was wondering (16 square root of x-3) times(...

College Algebra - I need some help with a handful of questions. I need to see ...

College Algebra - I need some help with a handful of questions. I need to see ...

College Algebra help please - I need some help with a handful of questions. I ...

math - Solve for the indicated variable A=1/2 bh Solve for b 2A = bh, so b = 2A/...