book Maths Puzzle Numerical Ability

Page 210 Problem 44.g(10)
Question; Let g(x)= -x squared + 4x+1.

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Hi Tutors:
Please help me put this word problem into Algebra form and solve.

Area of Rectangle. The width of a rectangle is fixed at 16yd. For what lenghts will the area be at what is is the answer to the radical expression: 4 radical 18-3 radical 32+ radical 50

i dont know how to represent radical signs