Question

. Find the roots of the quadratic equation x2 – 8x = 9 by completing the square. Show your work.

Answer 1

\[x^2 - 8x = 9\]
Right now it's in this form:
\[ax^2-bx=c\]


\[ax^2-bx+c\]
^This should be the form to get it in as a first step

Answer 2

yes ^ follow him

Answer 3

this is an easy way to do this, although you could subtract \(9 \) from both sides and then factor

Answer 4

how do i factor?

Answer 5

\[x^2-8x-9=0\] think of two numbers whose product is \(-9\) and that add to give \(-8\)

Answer 6

i was thinking -3 but it wont add up to -8

Answer 7

no \(-3\) and \(3\) add up to 0

Answer 8

only other way i can think of is \(-9\) and \(1\)

Answer 9

i understand now thanks :)

Answer 10

yw