Question

x^2-18x=100

Answer 1

x=9-sqrt181 and 9+sart181

Answer 2

Cannot factor, use quadratic formula

Answer 3

\[9+\sqrt{181},9-\sqrt{181}\]

Answer 4

if you add 81 to both sides, you can factor and ignore that silly quadratic formula.
x^2-18x=100
x^2-18x+81=181
(x-9)^2=181
\[x=9\pm\sqrt{181}\]

Answer 5

Let them learn quadratic formula okay?

Answer 6

I cant imagine if a graduate don't know how to use quadratic formula

Answer 7

they dont need to know the quadratic formula... completing the square is a much better use of one's time when learning math--as opposed to memorizing a formula and plugging it in.

Answer 8

\[9+\sqrt{91 ,9} - \sqrt{91}\] this was the correct answer

Answer 9

actually that is not the correct answer

Answer 10

this was
\[9+\sqrt{181},9-\sqrt{181}\] as per .Sam

Answer 11

?

Answer 12

what .Sam wrote is correct is all i am saying. the answer with the square root of 91 is wrong

Answer 13

all of us agreed on the same answer, the book or wherever mslorraine got the "correct" answer, was wrong.