CAHSEE Math 3.1 Algebra and Functions

Algebra and Functions: Drill Set 3, Problem 1. Evaluate the expression.

Algebra and FunctionsRate, speed, distance, and time
CAHSEE MathAlgebra and Functions
FunctionsBasics of Functions
LanguageEnglish Language

Transcript

00:27

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

00:30

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

00:36

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

00:43

Now for the y's.

00:44

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

00:49

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

00:53

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

00:55

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

01:02

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

01:06

Plugging has never been more fun.