Question

Find z if 9 z = (79)2 – ( 61)2​

Answer 1

Answer:

Z = 280

Step-by-step explanation:

9z = (79)² - (61)²

$9z = (79 - 61)(79 + 61) \: \: \: \: \\ {a}^{2} - {b}^{2} = (a - b)(a + b) \\ \\ z = \frac{(79 - 61)(79 + 61)}{9} \\ z = \frac{18 \times 140}{9} \\ z = 2 \times 140 \\ z = 280$

Hope you get your answer