exam Maths Puzzle Numerical Ability

solve the following equation for x

2x^2-4t+4=6

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exam Other Question

divide

x2 - 9x + 20 ÷ x2 - 25
------------ ÷ ---------
6x - 4 ÷ 2x + 10

I am totaly stumped, please help!!!
If f(x)=x(x-1)(x-4)^2, use interval notation to give all values of x where f(x)>0. My answer is (-infty,0) u (1,4) u (4,infty) is this right. thanks again.