book Maths Puzzle Numerical Ability

what does "x" equal?

(x+1)(x-3)=4


What does "x" equal?

x(x-2)= -6

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book Other Question

a group of 80 people attended a ball game. There were three times as many children as adults in the group. How many children were in the group? simplify:-
(log3 135)/(log15 3) - (log3 5)/(log405 3)