SOLUTION: I have to complete the square to change the form of the function and grph the quadractic function????
f(x) = -2x^2 -5x +1
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Question 468430: I have to complete the square to change the form of the function and grph the quadractic function????
f(x) = -2x^2 -5x +1
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
f(x) = -2x^2 - 5x + 1
:
-2x^2 - 5x + ___ = -1
divide by -2, change the signs
x^2 + x + ___ =
:
Find the term that will complete the square, add to both sides
Divide the coefficient of x by 2 and square it (5/4)^2 = 25/16
x^2 + x + = +
:
x^2 + x + = +
:
x^2 + x + =
:
(x + )^2 =
:
x + = +/-
Two solutions
x = +
x =
and
x = -
x =
:
:
The graph
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