book Maths Puzzle Numerical Ability

If P(x)=8x-4x^2, then find P(2/x) by synthetic substitution

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book Other Question

A truck gets 19 miles per gallon. How many gallons of gas would be needed to get to a destination that is 1,558 miles away? Here I need to factor the quadratic expression completely, and find the roots of the expression.

135x^2 - 222x + 91