Write the polynomial that represents the width of the river where it passes between the two cabins.Then calculate the width if x=3

Question

Two cabins on opposite banks of a river are 12x^2-7x+5 feet apart. One cabin is 9x+1 feet from the river. The other cabin is 3x^2+4 feet from the river.

Answer 1

(12x²-7x+5) - (9x+1) - (3x²+4) = width of the river

 

9x²-16x = width of the river

 

At x=3, width of the river is 33 feet.