Chap 2: Real Numbers - Spot the Common Mistakes (IV)

Revision Exercise 2 (p52 of Textbook) No. 7(d)

11 comments:

  1. 2/3 x 1/8^2
    =2/3 x 1/64
    =1/96
    2nd line onwards is wrong

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  2. Line 2 - When (1/4 - 1/8)^2 is 1/64
    However the answer is (1/4)^2- (1/8)^2 is 3/64

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  3. Everything was wrong from the second line.. the answer should be 1/96

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  4. line 2 to 5. (1/4 - 1/8)^2 should be 1/64. therefore the following lines are wrong.

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  5. The second line is wrong. It should be 2/3 x 1/96, thus all the other answers are wrong too.

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  6. The mistake was made at Line 2.
    The "power" of 2 shouldn't have been brought inside the brackets, causing an error in the answer.
    It should be like this:
    (1/8) X (1/8)= 1/64
    2/3 X 1/64 = 1/96(Answer)

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  7. the mistake happened at line two.the power should have stayed outside of the brackets.it should have stayed like this:
    2/3x[(1/4)x(1/8)}^2

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  8. The power of 1/4 and 1/8 should be outside the bracket and powered when 1/4 - 1/8

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  9. In line 2, 1/8 should have been subtracted from 1/4 before square rooting itself instead of square rooting the two fractions first and then subtracting the second fraction from the first one.

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  10. power should be outside the bracket,not inside in line 2
    Correct method:
    (1/8) X (1/8)= 1/64
    2/3 X 1/64 = 1/96

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  11. It should be...
    1/4-1/8
    =2/8-1/8
    =1/8
    1/8x1/8=1/64
    2/3x1/64=1/94

    ReplyDelete