Solve; (a-b) power2 = (a+b)power2-4ab.​

Step-by-step explanation:

( a - b)² = ( a +b)² - 4ab

or

( a + b)² - (a-b)² = 4ab

LHS

( a + b)² - (a-b)²

= (a² + 2ab + b²) - (a² - 2ab + b²)

= a² + 2ab + b² - a² + 2ab - b²

= 4ab

RHS proved

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.