Sunday, September 11, 2011

Math Viva Voce


video

Part A
Question 1

question 1 part 1)
    AB = DC → (2x+3) = (3x-7)
    > so i simplified it by taking away the     brackets
    2x+3 = 3x-7
    > now i exchanged 3 and 3x across the     equal sign, by doing so, the positive     changed to negative
    2x-3x = -3-7
    > so now if -x equals to -10 , therefore x =     10
    -x = -10
    x = 10


ii)
    Area of ABCD = (3x-7)(4x-30)
    > now i substituted x to 10 because of my     previous answer.
    = (3(10)-7)(4(10)-30)
    > so i simplified it
    = (23)(10)
    = 230
    > so my answer is 230 cm²
    Area = 230 cm²

iii)
    > I changed cm² to m²
    230cm² = 0.023m²
    > so my answer is 0.023m²

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