Question

Evaluate (69)power2 using identity

Answer 1

Hey mate!

your answer is as follows-

69²

=(70-1)²

we know that (a-b)²=a²-2ab+b²

so,

(70-1)²=70²-2*70*1+1²

=4900-140+1

=4901-140

=4761

mark it as brainliest dear.....

Thank you...

Answer 2

4761 is the answer

Step-by-step explanation:

We can use the identity $(a + b)^2 = a^2 + b^2 + 2ab$

So, changing the given question in the above form

69 can be written as (60 + 9)

So, a = 60 and b = 9. Hence, the above formula can be applied.

$(69)^2 = ( 60 + 9)^2$$= 60^2 + 9^2 + 2\times 60\times 9$ = 3600 + 81 + 1080 = 4761

Thus, the answer is 4761.