Quadratic Equations and Expressions Question
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Trent and Madison are asked to find the maximum of f(x)=-3x2+9x+6.
Madison:
x=-9(2⋅-3)=-32
f(-32)=-3(-32)2+9(-32)+6
=-14.25
The maximum is -14.25.
Trent:
x=-9(2⋅-3)=32
f(x)=-3(32)2+9(32)+6
=12.75
The maximum is 12.75.
Who is correct?
Madison:
x=-9(2⋅-3)=-32
f(-32)=-3(-32)2+9(-32)+6
=-14.25
The maximum is -14.25.
Trent:
x=-9(2⋅-3)=32
f(x)=-3(32)2+9(32)+6
=12.75
The maximum is 12.75.
Who is correct?
- Madison
- Trent
- Neither