Question

evaluate 78 into 82 by identity​

Answer 1

Question:-

• Evaluate 78x82 by using identity.

Solution:-

$\sf 78 \times 82$

$\sf = (80 - 2)(80 + 2)$

Now, we know that,

$\sf (x + y)(x - y) = {x}^{2} - {y}^{2}$

So,

$\sf (80 - 2)(80 + 2)$

$\sf {(80)}^{2} - {(2)}^{2}$

$\sf = 6400 - 4$

$\sf = 6396$

Hence,

$\boxed{ \sf 78 \times 82 = 6396}$

Answer 2

Answer:

78×82

6396

I hope this is helpful for you