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Extra resources for Criteria for the Simplification of Algebraic Plane Curves

Example text

But the graph never touches the x-axis, so the function value never really reaches 0. For numbers in the domain smaller than 5, the curve is below the x-axis. These function values are negative — some really small. But, again, the y values never reach 0. So, if you guessed that the range of the function is every real number except 0, you’re right! You write the range as p ≠ 0, or (–∞, 0) , (0, ∞). Did you also notice that the function doesn’t have a value when x = 5? This happens because 5 isn’t in the domain.

In other words, the domain is the set of all numbers that you can input without creating an unwanted or impossible situation. Such situations can occur when operations appear in the definition of the function, such as fractions, radicals, logarithms, and so on. Many functions have no exclusions of values, but fractions are notorious for causing trouble when zeros appear in the denominators. Radicals have restrictions as to what you can find roots of, and logarithms can only deal with positive numbers.

3. Check your answers. The only solution for this equation is dandy answer. — a perfectly 44 Algebra II Essentials For Dummies Solving quadratic-like trinomials Trinomials are expressions with three terms, with the highest term raised to the second degree, the expression is quadratic. You can simplify quadratic trinomials by factoring them into two binomial factors. ) Solve the trinomial equation 3x–2 + 5x–1 – 2 = 0. You find the quadratic-like pattern: ax–2n + bx–n + c. Factoring and setting the two factors equal to 0: You produce two solutions, and both work when substituted into the original equation.