book Maths Puzzle Numerical Ability

find the following:

-f(x) for x^2-1/x+4

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book Other Question

Solve the following simultaneous equation:

r^2 + s - 7 = 0; r - s = 5

Please show any working out and thank you in advance for your help Solve By elimination

-x+8y=-32
3x- y=27