exam Maths Puzzle Numerical Ability

FROM A SQUARE PIECE OF CARDBOARD WITH WIDTH x INCHES, A SQUARE OF WIDTH x-3 INCHES IS REMOVED FROM THE CENTER. WHAT IS THE AREA OF THE REMAINING PIECE AS A FUNCTION OF x.

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The Pool Fun Company has learned that, by pricing a newly released Fun Noodle at $3 sales will reach 9000 Fun Noodles per day during the summer. Raising the price to $4 will caus Evaluate each function for the value specified:
f(x)=x(to the power of 2)-7x+10: find (a)f(0), (b)f(5), and (c)f(-2).
McGraw Hill 6th edtion, chapter 7.5 exercise # 2
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