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Teachers & SchoolsAlgebra and Functions: Drill Set 3, Problem 1. Evaluate the expression.

Algebra and Functions | Rate, speed, distance, and time |

CAHSEE Math | Algebra and Functions |

Functions | Basics of Functions |

Language | English Language |

If we substitute 3 as x and 2 as y, we can

rewrite the equation as 3 times 3 cubed minus 4 times 2 to the negative second...

3 cubed is 27... and 3 times 27 is 81 and we're done with the first part

Now for the y's.

Don't forget that little negative sign next to the 2 in the exponent.

Remember that negative exponents basically just mean "1 over"...

...so we can move the y squared into the denominator...

...and rewrite that second part as 4 over 2 squared. 2 squared is 4. 4 over 4 is 1.

We subtract one from 81 and we get 80. Answer: D

Plugging has never been more fun.