book Maths Puzzle Numerical Ability

(sqrt2+3sqrt3)(sqrt12-4sqrt8)

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book Other Question

if we graph the equation x = 0, this is the x axis, do we say that this linear equation has many "x -intercepts"?..in other words do we say a line can "cross itself" many times? The sales price of a car is $12,590, which is 20% off the original price. What is the original price?