Question

list the missing value after completing the square for this equation.
x^2+10x-7=0
x=-5+4 sqrt __?

Answer 1

it says 128 is wrong???

Answer 2

no it is
\[5\pm4\sqrt{2}\]

Answer 3

there is a way to dbl chk answers instead of blindly filling in any one you get ;)

Answer 4

lol yeah im just trying to finish my last worksheet so i can get my credit for this class

Answer 5

understandable ☺☻☺

Answer 6

like so
\[x^2+10x=7\]
\[(x+5)^2=7+25=32\]
\[x+5=\pm\sqrt{32}\]
\[x=-5 \pm\sqrt{32}\]
\[x=-5\pm 4\sqrt{2}\]

Answer 7

last step because
\[\sqrt{32}=\sqrt{16\times 2}=\sqrt{16}\times \sqrt{2}=4\sqrt{2}\]