Question 187019: I have tried to get some of these but I have a problem of being just a little off and then blowing the whole deal. Please help.
Write standard form and identify a, b, and c.
4x² + 4 = 2x + 3
I need to solve this equation.
x(x-3) = 40 Would it be -5,-8?
Find the x-intercepts
Y = x² +4
And yet another one.
Y = x² -4x -32
Find the ordered pair for the vortex.
Y = 2x² -4x +6 Could it be (4,1)?
Solve the specified variable.
a/(l-r) for r Could it be r = a/s ?
Answer by user_dude2008(1862)   (Show Source):
You can put this solution on YOUR website! "Write standard form and identify a, b, and c.
4x² + 4 = 2x + 3 "
4x² + 4 = 2x + 3
4x² + 4 - 3 = 2x
4x² + 4 - 3 - 2x = 0
4x² - 2x + 1 = 0
Now in standard form: ax^2+bx+c = 0 ---> a = 4, b = -2x, and c = 1
----------------------------------------------------------
x(x-3) = 40
x^2-3x=40
x^2-3x-40=0
(x-8)(x+5)=0
x = 8 or x = -5
close...off by a sign
----------------------------------
x-intercepts:
Y = x² +4
0 = x² +4
x^2 = -4
x = sqrt(-4)
x = 2i or x = -2i
--------------------------------
x-intercepts:
Y = x² -4x -32
0= x² -4x -32
(x-8)(x+4)=0
x=8 or x=-4
------------------------------------------------
2x² -4x +6 ---> a=2, b=-4, c=6
x = -b/2a
x=-(-4)/(2(2))
x=4/4
x=1
y=2(1)^2-4(1)+6
y=2(1)-4(1)+6
y=2-4+6
y=4
Vertex: (1,4) ... mixed up coordinates
---------------------------------------------------
can't solve a/(l-r) since it is not equation
|
|
|
