How to change reciprocal to sinificant figure

How do you convert reciprocal?

The definition of "reciprocal" is simple. To find the reciprocal of any number, just calculate "1 ÷ (that number)." For a fraction, the reciprocal is just a different fraction, with the numbers "flipped" upside down (inverted). For instance, the reciprocal of 3/4 is 4/3. Any number times its reciprocal will give you 1.

Step-by-step explanation:

Step-by-step explanation:

A )   a²- 2ab + b² = (a - b)²

4x² - 12x + 9 =  (2x)² - 2 *2x *3 + 3²

                    = (2x - 3)²

Length of each side of a square = 2x -3

b) a² - b² = (a +b)(a - b)

16x² - 9y² = 4²*x² - 3²*y²

                = (4x)² - (3y)²

                = (4x + 3y) (4x - 3y)

Dimensions of rectangle are :  (4x +3y); (4x - 3y)