Question

19.Evaluate (531)² - (530)²



a) 1

b) -1

c) 1061

d) -1061

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Answer 1

Answer:

c -1061

Step-by-step explanation:

1061 is correct answer

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Answer 2

Answer:

$using \: identity \\ {x}^{2} - {y}^{2} = (x + y)(x - y) \\ where \\ x = 531 \: \: \: and \: \: y = 530 \\ {531}^{2} - {530}^{2} = (531 + 530)(531 - 530) \\ = 1061 \times 1 = 1061$