You can then divide both sides by and be left with: Now you need to see that can be expressed as or as. This allows you to factor the common term on the left hand side of the equation to yield:Īnd of course you can simplify the small subtraction problem within parentheses to get:Īnd you can take even one further step: since everything in the equation is an exponent but that 4, you can express 4 as to get all the terms to look alike: Most exponent rules deal with multiplication/division and very few deal with addition/subtraction, so if you're stuck on an exponent problem, factoring can be your best friend.įor the equation, can be rewritten as, leveraging the rule that when you multiply exponents of the same base, you add the exponents. Whenever you are given addition or subtraction of two exponential terms with a common base, a good first instinct is to factor the addition or subtraction problem to create multiplication. This also gives you the correct answer, as when you sum the terms within parentheses you end up with: Had you gone that route, the factorization would have led to: Note that you could also have started by factoring out from the given expression. When you sum the fractions (and 1) within the parentheses, you get: ![]() Here you can do the arithmetic on the smaller exponents. If you factor the common, the expression becomes: Because all numbers are 2-to-a-power, you'll be factoring out common multiples either way. Here you can choose to factor out the biggest "number" by sight,, or the number that's technically greatest. Factoring negative exponents may feel a bit different from the more traditional factoring that you do more frequently, but the mechanics are the same. Here if you factor out common terms in the given equation, you can start to see how the math looks like the correct answer. Remember: S O A P when it comes to signs of cubic factoring.This problem rewards your ability to factor exponents. (Remember that FOIL stands for First-Outer-Inner-Last when multiplying two binomials together): \(\) Revisiting Factoring QuadraticsĮarlier, we learned how to factor, or “un FOIL” a trinomial into two binomials. Revisiting Factoring Quadratics Factoring and Solving with Exponents Factoring Sum and Difference of Cubes More Practice Factoring and Solving with Polynomialsįactoring is extremely important in math we first learned factoring here in the Solving Quadratics by Factoring and Completing the Square section.
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