exam Maths Puzzle Numerical Ability

what values are excluded from the domain of the function
a) f(x)=5x+1
b)g(x)=3x+1/x+3

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exam Other Question

1) Which of the following is an equation of the hyperbola with vertices at (3,5) and (3,-1) and foci at (3,7) and (3,-3)?

a) (x-3)2 /25 - (y-2)2/9 = 1 b) (y-2)2/9- (x-3)2/25 = Solve the system by addition. x + y = 9 x � y = 9