
Concept explainers
To find: The maximum height of the baseball whose height is given by the function y=−16t2+80t+2 .
The maximum height of the baseball is 102 .
Given information:
The height of the baseball is given by the function y=−16t2+80t+2 .
Concept used:
Vertex form a quadratic function is given as y=a(x−h)2+k , where (h,k) is the vertex of the quadratic function.
The vertex of the quadratic function represents the maximum/minimum point of the function.
If a positive, the vertex is the minimum point and if a is negative, the vertex is the maximum point of the function.
Calculation:
Find the vertex of the given function by writing it into vertex form.
y=−16t2+80t+2=−16(t2−5t)+2=−16(t2−2⋅x⋅52+(52)2−(52)2)+2=−16((t−52)2−(52)2)+2=−16(t−52)2+16(52)2+2=−16(t−52)2+16⋅254+2=−16(t−52)2+100+2=−16(t−52)2+102
Here, a=−16 , which is negative. So, the vertex of the function is the maximum point of the function.
The vertex is (52,102) . Therefore, the maximum height of the baseball is 102 .
Conclusion:
The maximum height of the baseball is 102 .
Chapter 1 Solutions
Mcdougal Littell Algebra 2: Student Edition (c) 2004 2004
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