SOLUTION: how do you write y=(x-4)(x+2) in standard form? with the standard form of the equation use the quadratic formula to identify the x-value of the vertex. use the quadratic formula w

Question 1024230: how do you write y=(x-4)(x+2) in standard form?
with the standard form of the equation use the quadratic formula to identify the x-value of the vertex. use the quadratic formula with the vertex -b/2a then substitute the x-value of the vertex into the original equation to find the y-value of the vertex then write the coordinates of the vertex. what are the 3 points to graph an parabola? PLEASE HELP
Found 3 solutions by josgarithmetic, MathTherapy, robertb:
Answer by josgarithmetic(39616)   (Show Source): You can put this solution on YOUR website!
The term is based on .

You may be able to do the problem on your own.
Perform the multiplication on the right side member.
Identify the values of a and b.
Form the term needed for ; and use this to find the value of y.

You may also benefit from a helpful instructive video:
changing quadratic equation from general to standard form
Answer by MathTherapy(10551)   (Show Source): You can put this solution on YOUR website!

how do you write y=(x-4)(x+2) in standard form?
with the standard form of the equation use the quadratic formula to identify the x-value of the vertex. use the quadratic formula with the vertex -b/2a then substitute the x-value of the vertex into the original equation to find the y-value of the vertex then write the coordinates of the vertex. what are the 3 points to graph an parabola? PLEASE HELP

Standard form of equation: y = (x - 4)(x + 2):
The x-value of the vertex is: ----> ------>

------ Substituting 1 for x
y = 1 - 2 - 8 -------> ------ y-value of vertex
Coordinates of vertex:
(x - 4) = 0 and (x + 2) = 0
Roots:
3 points to graph this parabola:
Answer by robertb(5830)   (Show Source): You can put this solution on YOUR website!
You don't even have to use formulas to find the vertex of the parabola if you know the roots.
y = (x-4)(x+2) ==> the roots of the equation are 4 and -2. The x-coordinate of the vertex should be the average of the two roots, namely . To find the y-coordinate of the vertex plug it into the original equation:
y = (1-4)(1+2) = -3*3 = -9.
==> (h,k) = (1,-9)

==> , the standard form of the equation
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