exam Maths Puzzle Numerical Ability

This problem is very similar to one on my homework project. Can you please help explain how to work this problem properly.

(2√3a - √b)( √3a + 3√b)

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exam Other Question

the width of a rectangle whose perimeter is 6 m and whose length is x a box of apples weighs 42 pounds, plus or minus 1/2 pound. write an absolute value inequality expressing this fact. let w equal the weight of a box of apples.