Posted by sc on Friday, May 29, 2009 at 2:41am.
how can I figure out the formula. example. I need to transform the following equation y = x2 + 4  8 into vertex form and then I need to state the coordinates of the vertex of the parabola. I forgot how to arrive at the answer

9th. algebra  Reiny, Friday, May 29, 2009 at 7:24am
I will assume there is a typo and you meant
y = x^2 + 4x  8
take 1/2 the coefficient of the x term, square it, then add and then subtract it
( 1/2 of 4 is 2 and then squared would be 4)
y = x^2 + 4x + 4  4  8
the first three terms are now a perfect square
y = (x+2)^2  12
compare this with
y = a(xp)^2 + q which has vertex (p,q) and you can conclude that the vertex of
y = (x+2)^2  12 is (2,12)
Answer This Question
Related Questions
 Math  I need help in finding the vertex of a parabola using an equation in this...
 algebra  Rewrit the equation in vertex form. Name the vertex and yintercept. y...
 maths  how do i find out the the equation of the line of symmetry for f(x)=ax^2...
 Algebra 2  Hey I am working on math homework that involves "Standard Form to ...
 Algebra  Identify the vertex and the axis of symmetry for the graph of y=5(x2...
 Math  Put the quadratics below into vertex form by completing the square. state...
 Math  Put the quadratics below into vertex form by completing the square. state...
 algebra  1)Find the exact solutions to 3x^2=5x1 using the quadratic formula. ...
 algebra 2  A quadratic equation can be written in vertex form or in standard ...
 Math  y^2=8(x3) how would you get the coordinates. vertex = 3,0 then what? let...
More Related Questions