Question

Factorise : a²-81(b-c)^2
Answer this please.​

Answer 1

Answer:

Perfect number: (A number is called Perfect if it is equal to the sum of its factors other than the number itself.)

Example: 6 = 1 + 2 + 3

import java.util.Scanner;

public class KboatPalinOrPerfect

{

public static void main(String args[]) {

Scanner in = new Scanner(System.in);

System.out.println("1. Palindrome number");

System.out.println("2. Perfect number");

System.out.print("Enter your choice: ");

int choice = in.nextInt();

System.out.print("Enter number: ");

int num = in.nextInt();

switch (choice) {

case 1:

int copyNum = num;

int revNum = 0;

while(copyNum != 0) {

int digit = copyNum % 10;

copyNum /= 10;

revNum = revNum * 10 + digit;

}

if (revNum == num)

System.out.println(num + " is palindrome");

else

System.out.println(num + " is not palindrome");

break;

case 2:

int sum = 0;

for (int i = 1; i <= num / 2; i++) {

if (num % i == 0) {

sum += i;

}

}

if (num == sum)

System.out.println(num + " is a perfect number");

else

System.out.println(num + " is not a perfect number");

break;

default:

System.out.println("Incorrect Choice");

Answer 2

Answer:

2−81(−)2

a^{2}-81\left(b-c\right)^{2}

a2−81(b−c)2

2−81(−)(−)

Step-by-step explanation:

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