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