ashleyb
a function is defined as f(x)= 8x^2. what is f(3)?



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jim_thompson5910
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replace each x with 3 and evaluate

jim_thompson5910
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f(x)= 8x^2
f(3)= 8(3)^2
f(3) = ???

ashleyb
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i got 576

jim_thompson5910
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you first square 3 to get 9
THEN you multiply
you don't multiply 8 and 3 to get 24 and square it to get 576

jim_thompson5910
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PEMDAS says that you evaluate exponents first, then multiplication comes next

ashleyb
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72

jim_thompson5910
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better