Question

Using the identity for difference of two squares, evaluate the following:
a) 18 × 22
b) 51 × 49
c) 101 × 99

Give the proper answer otherwise the answer will be deleted..(Don't give silly answers...
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Answer 1

Step-by-step explanation:

(x+a)(x-a)

x² + a²

(20+2)(20-2)

20² + 2²

400 - 4

396

(50+1)(50-1)

50² - 1²

2500 - 1

2499

(100+1)(100-1)

100² - 1²

10000 - 1

9999

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Answer 2

Answer:

a)396

b)2499

c)9999

Step-by-step explanation:

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

18×22

(20-2)(20+2)

20^2-2^2

400-4

396

51×49

(50+1)(50-1)

50^2-1^2

2500-1

2499

101×99

(100+1)(100-1)

100^2-1^2

10000-1

9999

hope it helps

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