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Have you seen many mistakes like the below?
Question 1:
3x = 27
Solution:
3x = 34 ===> x = 4
Question 2:
9x = 33
Solution:
33x = 33 ===> 3x = 3 ===> x = 1
Why the error?
A simple explanation is that the maths learner is not familiar with the basic multiplication of repeated numbers.
3 x 3 = 9
4 x 4 = 16
5 x 5 = 25
6 x 6 = 36
7 x 7 = 49
2 x 2 x 2 = 8
3 x 3 x 3 = 27
2 x 2 x 2 x 2 = 16
etc.....
Once you have mastered this basic repeated multiplications, you can rest assure that indices question will not be there to haunt you.
How about solving "x" in this 9x + 1 + 2(3x) - 3 = 0 ?
I bet that if you understood the above criteria of learning indices, the equation can be easily solved for x (using quadratic formula as a hint).
All complex things start off with simple things.
Do you agree this applies to maths?
:D
Thursday, 12 March 2009
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2 comments:
That is not solvable, right? because you can't square root -20
Oh, yes, the problem is solvable.
a = 9, b=2 and c= -3. Using quadratic formula, you will be able to get square of 118.
You may refer to this link at
Solving Index Expression
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