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In $3-20$ , perform the indicated additions or subtractions and write the result in simplest form. In each case, list any values of the variables for which the fractions are not defined.$$\frac{a-1}{5}-\frac{a+1}{4}$$

$\frac{-a-9}{20}$

Algebra

Chapter 2

THE RATIONAL NUMBERS

Section 4

Adding and Subtracting Rational Expressions

Fractions and Mixed Numbers

Decimals

Equations and Inequalities

Missouri State University

McMaster University

University of Michigan - Ann Arbor

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In $3-20$ , perform the in…

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Okay, so this question were asked to perform subtraction on these two fractions, we have a minus one over five bias, a plus one over four. So these two don't have any hate limiting factors for a as a Zen, the numerator and can equal anything, and you're real number. But what we do need to do is make the denominators a common denominator. And to do this, the greatest common factor for the least common multiple for these two would be 20. So for the first fraction to equal have a denominator 20 money to multiply by four before this gives us for a minus for over 20 and for the second fraction, to be equal to have a denominator of 20 minutes need to multiply by five over five, which gives us five a plus five. Okay, so now we can just go ahead and do more. Most attraction, I guess, on the numerator. So here will have for a minus 5,000,000 which gets you negative A and the negative four minus phi, which gives your negative not so final answer is negative. A minus nine over 20

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