can someone please show me how to get x by itself i got most of it done but i dont know how to do the rest.
X^2+24X+90=0
X^2+24=-90
X^2+24=54
(X+12)^2=54
sqrt(X+12)^2=sqrt54
x+12=+-3sqrt6

Question

can someone please show me how to get x by itself i got most of it done but i dont know how to do the rest.
	X^2+24X+90=0
X^2+24=-90
X^2+24=54
(X+12)^2=54
sqrt(X+12)^2=sqrt54
x+12=+-3sqrt6

anonymous · Answer

@terenzreignz

jim_thompson5910 · Answer

subtract 12 from both sides to get

$$\large x = -12 \pm 3\sqrt{6}$$

anonymous · Answer

is this my answer x=+-3-12sqrt6

jim_thompson5910 · Answer

no it is $$\large x = -12 \pm 3\sqrt{6}$$

anonymous · Answer

how?  subtracted 12 from both

jim_thompson5910 · Answer

btw you have a typo on line 3, it should be

x^2 + 24x + 144 = -90 + 144

jim_thompson5910 · Answer

yeah you go from 

x+12=+-3sqrt6

to

x = -12+-3sqrt6

jim_thompson5910 · Answer

after you subtract 12 from both sides (you don't combine the terms since they aren't like terms)

anonymous · Answer

oh ok thanks i see what i did wrong

jim_thompson5910 · Answer

ok great