Question

find 390 multiple 410 of identity (a+b)(a-b)=a-b​

Answer 1

Answer:

$390 \times 410 = a$

$a + b$

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Answer 2

Step-by-step explanation:

390 x 410

= (400 - 10)(400 + 10)

Using

$(a - b)(a + b) = {a}^{2} - {b}^{2}$

Here, a = 400 and b = 10

Therefore

$(400 - 10)(400 + 10) = {400}^{2} - {10}^{2}$

$= 160000 - 100$

$= 159900$