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### High School Mathematics2.71 Problems on Radicals Using Formulas - III

 Example: Expand (Ö3 + Ö2)(Ö3 - Ö2). Solution: The above problem in the form of (a + b)(a - b) = a2 - b2. Here a = Ö3 and b =Ö2. Substitute these values in the above formula we get, (Ö3 + Ö2)(Ö3 - Ö2) = (Ö3)2 - (Ö2)2. = 3 - 2 = 1 Directions: Solve the following problems. Also write at least ten examples of your own.
 Q 1: Expand (Ö11 + Ö7) (Ö11 - Ö7).-2-424 Q 2: Expand (Ö7 + Ö8) (Ö7 - Ö8).-1-212 Q 3: Expand (Ö19 + Ö3) (Ö19 - Ö3).None of these161418 Q 4: Expand (Ö17 + Ö2) (Ö17 - Ö2).-1717-1515 Q 5: Expand (Ö17 + Ö7) (Ö17 - Ö7).1681014 Q 6: Expand (Ö10 + Ö5) (Ö10 - Ö5).97511 Q 7: Expand (Ö10 + 2) (Ö10 - 2).612810 Q 8: Expand (Ö11 + 3) (Ö11 - 3).6785 Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!

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