x (x-3) = 0
x = 0 or x = 3
before looking at your answer i found the answer to be 0 too but like this:
was my way right
No, because -0x-0x is not -3x
You missed the x = 3 root entirely.
Please do it my way :)
If you insist on completing the square:
x^2 - 3x = 0
(-3/2)^2 = 9/4
x^2 - 3 x + 9/4 = 9/4
(x-3/2)^2 = 9/4 =3/2
x- 3/2 = +/- 3/2
x = 3/2 + 3/2 = 3
x = 3/2 - 3/2 = 0
by the way
x = 5
x+2 = 0
x = -2
do i always have to mention the ors
If it is a quadratic, in general it has two solutions, so you need to give both.
Sometimes, if the vertex of the parabola is exactly on the x axis, the two roots will be the same. For example:
x^2 -4x + 4 = 0
(x-2)(x-2) = 0
x = 2
x = 2
oh, okay, thank you!
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