book Maths Puzzle Numerical Ability

p(x)=x^3-(a+1)x^2+(a-6)x+6a where x is the variable and z is a parameter. P has two more real roots they are ____ and ____.

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book Other Question

Can you help me with this:

6 3/4 divided by 3
solve:y-3.5y-3=1.8(y+5.5)