exam
Maths Puzzle
Numerical Ability
I need help solving for x in the following problem: 3(cx-b)+c = ax+d/a
The ax+d part is all over a.
I have no idea where to start, but I know proportions can be used?
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exam Other Question
Simplify the rational expression:
(x/x^2-4)- (x+2/ x^2-x-2)
I am trying to find the numerator.
use the facts:
A=|a b|
|c d|,
then
A^-1=1/ad-bc|d -b|
|-c a| to find the inverse of the matrix, if possible. Check that AA^-1=I(base 2) and A^-1A=I(base2