Question

find a if 9a = (79)^2 - (61)^2​

Answer 1

Answer:

280

Step-by-step explanation:

9a= 6241 - 3721

9a = 2520

a= 2520/9

;. a = 280

Answer 2

Answer:

9a=(79-61)(79+61)

9a=18×140

a=18×140/9

a=280

Step-by-step explanation:

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