Algebra II Essentials For Dummies (For Dummies (Math & - download pdf or read online

By Mary Jane Sterling

ISBN-10: 047061840X

ISBN-13: 9780470618400

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5. Check your answers to avoid extraneous solutions. You now have to check to be sure that both your solutions work in the original equation. Remember: One or both may be extraneous solutions. Checking the original equation to see if the two solutions work, you first look at x = –1. Replace each x with –1: Nice! The first solution works. The next check is to see if is a solution. And right now I’m going to take “author’s privilege” and tell you that yes, the answer works. It takes more space than I have to show you all the steps, so I’m going to ask you to trust me and skip all the gory details.

You don’t have to eliminate anything, because you can’t find a fraction with the potential of a zero in the denominator, and you have no radical to put a negative value into. You write this domain with a fancy R, , or with interval notation as (–∞, ∞). Wrangling with range The range of a function is all its output values — all values you get by inputting the domain values into the rule (the function equation) for the function. You may be able to determine the range of a function from its equation, but sometimes you have to graph it to get a good idea of what’s going on.

But if you have a choice, I hope you choose the quickest and easiest ways possible, so I cover these first in this chapter (except for by-guess-or-by-golly). 24 Algebra II Essentials For Dummies Using the Square Root Rule When Possible Some quadratic equations are easier to solve than others. Half the battle is recognizing which equations are easy and which are more challenging. If a quadratic equation is made up of a squared term and a number, written in the form x2 = k, you solve the equation using the square root rule: If x2 = k, .

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Algebra II Essentials For Dummies (For Dummies (Math & Science)) by Mary Jane Sterling

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