the area of a rectangular field is equal to 50 square meters . its perimeter is equal to 30 meters . find the width of this rectangle .
"l * w = 50 : area , l is the length and w is the width . 2 l + 2 w = 30 : perimeter l = 15 - w : solve for l ( 15 - w ) * w = 30 : substitute in the area equation w = 5 and l = 10 correct answer a"
divide(subtract(divide(30, const_2), sqrt(subtract(multiply(divide(30, const_2), divide(30, const_2)), multiply(const_4, 50)))), const_2)