book Maths Puzzle Numerical Ability

IF f(x) = -3X + 6, FIND F^-1(X)

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book Other Question

two circles each of radius 5cms intersect each other. if the distance between their centres is 5 root 2 cms, find the area of the portion common to the two circles. factorise x to the power of 2 + 2x + 1 - y to the power of 2

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