Math, asked by anushka2947, 6 months ago

please help me and please solve both the parts step by step​

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Answers

Answered by pratyusha9294
1

Answer:

i. 958000

ii. 9980

Step-by-step explanation:

use the a^2 - b^2 formula

= (979 - 21)(979 + 21)

= 958 × 1000

= 958000

(99.9 - 0.1) (99.9 + 0.1)

= 99.8 × 100

= 9980

Answered by Snapskg730
1

Answer:

(979)² - (21)²

a² - b² = (a+b)(a-b)

= (979+21)(979-21)

= (1000)(958)

= 958000

(99.9)² - (0.1)² = (99.9+0.1)(99.9-0.1)

= (100)(99.8)

= 9980

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