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Chapter 5: Find the vertex,

x-intercept, y-intercept and the line of
symmetry of the Quadratic functions
and use the graphs to describe them
completely. Use the list of attributes
for describing graphs.
y= x2 – 2x – 15

User MartijnG
by
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1 Answer

5 votes

Answer:

See below

Explanation:

X-intercepts


f(x)=x^2-2x-15


0=x^2-2x-15


0=(x-5)(x+3)


x=5 and
x=-3


(5,0) and
(-3,0)

Y-intercept:


f(x)=x^2-2x-15


f(0)=0^2-2(0)-15


f(0)=0-0-15


f(0)=-15


y=-15


(0,-15)

Vertex:


f(x)=x^2-2x-15


f(x)=x^2-2x+(1-16)


f(x)=x^2-2x+1-16


f(x)=(x^2-2x+1)-16


f(x)=(x-1)^2-16


f(x)=(x-h)^2+k


(h,k)


(1,-16)

Line of Symmetry:


x=h


x=1

Chapter 5: Find the vertex, x-intercept, y-intercept and the line of symmetry of the-example-1
User Jeff Carey
by
7.2k points