exam Maths Puzzle Numerical Ability

If r and s are roots of x2-8x-3 =0, find the values of 1/r=1/s and (1/r)(1/s)

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/(4/25) (radical equation) Find the rank and nullity of the matrix
1 2 1 -1
2 3 2c+2 1
2 4 c+1 -2
1 2 c csquared-2

for all possible values of the parameter c.