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SAT Math Videos 171 videos
SAT Math 1.1 Algebra and Functions. Find an algebraic equation to correspond with the data.
SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?
SAT Math 1.1 Numbers and Operations. How many combinations of beverage and cereal can be made?
SAT Math 2.1 Algebra and Functions 272 Views
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Description:
SAT Math 2.1 Algebra and Functions. What is g(h(4))?
- Functions / Translations
- Functions / Function Notation
- Product Type / SAT Math
- Functions / Build a function that model a relationship between two quantities
- Functions / Build functions that model a relationship between two quantities
- Functions / Build a function that models a relationship between two quantities
- Functions / Build a function that models a relationship between two quantities
- Passport to Advanced Math / Quadratic and exponential functions (word problems)
Transcript
- 00:01
getting schmoopy with it yeah if G of N equals four N squared minus nine and H [text on screen]
- 00:07
of N equals the square root of n what is the G of H of four and here the
- 00:15
potential answers ah the suspense okay there's a lot of info crammed into this
- 00:20
thing but really all we have to know is what G of H of four is notice the
- 00:26
excessive number of parentheses in this problem as always we start with the [colorful googly-eyed parenthesis]
Full Transcript
- 00:32
innermost set of parentheses H of four the problem tells us that H of any [formulas on screen]
- 00:37
number n is equal to the square root of n any number is equal to four so let's
- 00:44
plug in 4 for n the square root of four is two so if H of 4 is equal to two then
- 00:51
we can replace H of four with two in the equation our new equation is G of two
- 00:56
the problem tells us that G of n is equal to four N squared minus nine and
- 01:01
since we said that our new equation is G of two we can replace n with two the
- 01:07
four times two squared minus nine we get four times four which is equal to 16 16
- 01:13
minus 9 equals seven and were there C is our guy [answer C is circled]
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