(x + 2) (x- 7), how to explain this quadratic equation in standard form​

Refer to interactive solution 17.45 to review a method by which this problem can be solved. the fundamental frequencies of two air columns are the same. column a is open at both ends, while column b is open at only one end. the length of column a is 0.504 m. what is the length of column b?

If you could answer these your a life saver

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?