The long side of a rectangle is 3x+21 units, and it's area is 3x^2+33x+84. find the width

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 1, 2−√3

Choose a second initial value that is 0.01 greater than the initial value from question 9. iterate it using the function, f, ten times. if necessary, you can round your results to the nearest ten-thousandth.

Which expression is equivalent to sq-80