Homework Clinic
Mathematics Clinic => Grade 10 Mathematics => Topic started by: camila on Jun 17, 2013
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how do I find the vertex of this without changing the form?
f(x)= -0.7(1.1-x)(3.2+x)
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1) find the roots:
x= 1.1
x=-3.2
The axis of symmetry is x= (1.1 - 3.2) /2= -1.05
So the x coordinate of the vertex is -1.05
Sub x= -2.1 into f(x), and you'll get the y coordinate of the vertex.
So the vertex is (-1.05, f(-1.05) )
I think you can continue from there.... :)
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the roots are 1.1 , - 3.2
so the vertex must be x = [1.1 + (-3.2)] / 2 = - 1.05 ( in the middle)