Quote: 9x^2 + x^2 = 576
9x
2 + x
2 = 576; add the x
2 terms together
10x
2 = 576; divide both sides by 10
x
2 = 576/10; take the square root of both sides
x = +/- sqrt(576/10); compute the square roots
x = +/- 24/sqrt(10); multiply top and bottom by sqrt(10) to get it proper form
x = +/- 24sqrt(10)/10; depending on what your teacher likes to see you can either leave it like this or do the division by 10 to obtain
x = +/- 2.4sqrt(10)
+6251 
