Question

11- Find the value of perfect square
56

(a) 57²-56²​

Answer 1

Answer:

$57 \times 2 = \114 - 112 = 2$

Step-by-step explanation:

11-56=-45

Answer 2

Answer:

Step 1:

What is the last number of 56? It is this number: 56. The answer is 6. Is 6 in the list of numbers that are never perfect squares (2, 3, 7 or 8)?

Answer: NO, 6 is not in the list of numbers that are never perfect squares. Let's continue to the next step.

Step 2:

We now need to obtain the digital root of the number. Here's how you do it:

Split the number up and add each digit together:

5 + 6 = 11

If the answer is more than one digit, you would add each digit of the answer together again:

1 + 1 = 2

What is the digital root of number 56?

Answer: 2

Step 3:

So now we know the digital root of 56 is 2. Is 2 in the list of digital roots that are always a square root (1, 4, 7 or 9)?

Answer: NO, 2 is not in the list of digital roots that are always perfect squares. We can conclude that 56 IS NOT a perfect square and we don't need to factor!