book Maths Puzzle Numerical Ability

If f(x) = x(x – 1)(x – 4)^2, use interval notation to give all values of x
where f(x) > 0.

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book Other Question

consider- log3 135 *log3 15
can this be written as (log3 135*15)raised to the power2 ?
i need help with this one

4x + 4y + Z=8
5x-2y-Z=12
3x + y + 3Z=-5