Question

verify of the identity (a_b)2=a2_2ab_b2​

Answer 1

Answer:

(a-b)2=a2-2ab+b2

(a-b)2=72-26×7+(6)2

49-2(42)+12

49-84+12

61-84

23

Step-by-step explanation:

this is the formula

Answer 2

Answer:

(a-b)^2 = (a-b) * (a-b)

           = $a^{2}$ -ab - ba + $b^{2}$

            = $a^{2}$ - 2ab +$b^{2}$

for verification let take a = 5 and b = 3

(a - b)^2 = (5 - 3)^2

             = 4 ------------------------------ ( 1 )

now ,

$a^{2}$ - 2ab +$b^{2}$ = 5^2 - 2(5)(3) + 3^2

                     = 25 - 30 + 9

                     = 4 ------------------------------- ( 2 )

from ( 1 ) and ( 2 )  $(a - b)^{2}$ =  $a^{2}$ - 2ab +$b^{2}$

hope it helps !