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What Does In Terms Of X Mean ? Y In Terms Of X

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October 4, 2021
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Does it mean make $x$ the subject?

*

*

Good question. This is a phrase jonathanlewisforcongress.comematicians and jonathanlewisforcongress.comematics teachers use a lot, and it has a specific meaning that isn”t entirely clear to the learner.

You are watching: What does in terms of x mean

Idiomatically speaking, to write a function “in terms of” a given variable or variables means to write an algebraic expression using only that variable or variables.

So for instance, given an equation $x+2y-3z = 0$, we can solve for $z$ in terms of $x$ and $y$ as $z=frac{1}{3}(x+2y)$.

Literally speaking, terms are the pieces that compose an expression. So in the expression $8x^2-8x$, $8x^2$ and $8x$ are terms combined by the subtraction function. The expression is in terms of $x$ since each term in the expression has only the variable $x$ (and constants) in it.

*

When it means

express in terms of $x$

It means to express the quantity you”re finding in terms of $x$, the variable.

Therefore,

Since:

$$f(x) = 2x^2 + 4x$$

So,

$$f(-2x) = 2(-2x)^2 + 4(-2x) = 8x^2 – 8x$$

*

It means find the function $g(x) = f(-2x)$ in such a way that everyobody who knows jonathanlewisforcongress.com can simply plug in any value of $x$ to find $g(x)$.

For example, if $f(x) = sin(x)$, then $f(-2x) = sin(-2x)$, or even better (always simplify if that is possible!) $sin(-2x)=-sin(2x)$ is the expression you are looking for.

See more: San Francisco To New Zealand Flight Time, San Francisco International

*

To evaluate $f(-2x)$, you will first compute $x”=-2x$, then $2x”^2+4x”$.

You are asked to remove the intermediate substitution step and come up with a straight expression $g(x)=f(-2x)$.

Obviously, $g(x)=f(-2x)=2(-2x)^2+4(-2x)=8x^2-8x$, which is the answer.

Thanks for contributing an answer to jonathanlewisforcongress.comematics Stack Exchange!

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.

Use jonathanlewisforcongress.comJax to format equations. jonathanlewisforcongress.comJax reference.

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