REX02 Evaluating Rational Expressions

In the previous video, we have learned about rational expressions. In this video, we learn how to evaluate rational expressions .  Watch the Tagalog math tutorial video above and then answer the exercises below. The complete video playlist of the Sipnayan tutorials on Rational Expressions can be found here.

Practice Exercise

Evaluate the following rational expressions.

1.)  If x = -2, find the value of

\dfrac{3x - 1}{x - 4}

2.) If y = 3, find the value of

\dfrac{y^2 + 5y - 6}{5y + 1}.

3.) The function f(x) = \frac{2x + 5}{-x + 7} is a rational function. Find f(0).

4.) If p = -4, q = 3, and r = 1, what is the value of

\dfrac{p^2 - qr + q^2}{p - r}

5.) If x = \frac{1}{2}, what is the value of

\dfrac{4x - 1}{2x^2 + 1}

Answers

1.  7/6
2. – 3/4
3. 5/7
4. – 22/5
5. 7/4

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