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How do I do this, I need to show work

How do I do this, I need to show work-example-1
User BenCole
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Hello,

-2<1 ==> f(x)=3x²-1 =>f(-2)=3*(-2)²-1=3*4-1=12-1=11
How do I do this, I need to show work-example-1
User Shekhar G H
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