Book Maths Puzzle Algebra

How would you simplify this equation:

4x^2(3x^2-2x+7)?

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Book Other Question

What are the formulas for finding the area, perimeter, diameter, volume, radius, and any others you might think of for all shapes.

I have a test in three days so please hurry A does 3/4 of piece of work in 24 days he then calls in B and both together complete the remaining work in 4 days.how long would B alone take to do entire work?