Question

the value of 405suare-404 sqaure

Answer 1

405² - 404² = 809

Given :

The expression 405² - 404²

To find :

The value of the expression

Formula :

a² - b² = ( a + b ) ( a - b )

Solution :

Step 1 of 2 :

Write down the given expression

The given expression is

405² - 404²

Step 2 of 2 :

Find the value of the expression

Use the formula a² - b² = ( a + b ) ( a - b )

$\sf {405}^{2} - {404}^{2}$

$\sf = (405 + 404) \times (405 - 404)$

$\sf = 809 \times 1$

$\sf = 809$

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