Question

Q6) Using a suitable identity find the value of r, if 9r = (72) ^ 2 - (27) ^ 2 .​

Answer 1

Answer:

r = 495. Please mark me as brainliest.

Step-by-step explanation:

Given, 9r = (72)^2 - (27)^2

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

9r = (72 + 27)(72 - 27)

9r = (99)(45)

9r = (9)(11)(45)

r = (11)(45)

r = 495

Answer 2

Answer:

4455

Step-by-step explanation:

9r = (72) ^ 2 - (27) ^ 2

RHS is in the form (a^2-b^2)

Identity:

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

Using the above identity,

a=72

b=27

=(72+27)(72-27)

=(99)(45)

=4455

PLS MARK ME AS BRAINLIEST