Answer:
Step-by-step explanation:
Add 1 and subtract 1, so that the expression won't change.

(a² - b²) = (a+b)(a - b)
Here a = x² - (1/x²) and b = 1
When the square root of a number is a whole number, this number is called a perfect square. ... Not all square roots are whole numbers. Many square roots are irrational numbers, meaning there is no rational number equivalent
Answer:
100+90+7
200+20
Step-by-step explanation: