exam Maths Puzzle Numerical Ability

solve x^2-7x-3=0 for x.

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exam Other Question

David has collected $6.50 in nickels and dimes. If he has 75 coins, how many of each kind of coin does he have? (x+1)(x+2)>x(x+1)=0
(x+1) (x+2)>(x+1)-x=0
2(x+1)>-x=0
-x=2