Please answer all this questions.(give me step by step explaination)If

1.	Please answer all this questions.(give me step by step explaination)If you know then only answer,if you don't know leave it. Other wise I will report you.
Answer» Answer: Step-by-step explanation: 1. 999 × 999 = 999² It can be WRITTEN as (1000 - 1)² (1000 - 1)² = (1000)² +(1)² -2.1000.1 (1000 - 1)² = 10,00,000 + 1 - 2000 (1000 - 1)² = 10,00,001 - 2000 (1000 - 1)² = 9,98,001 2. 501 × 501 = 501² It can be written as (500 + 1)² (500 + 1)² = (500)² + (1)² + 2.500.1 (500 + 1)² = 250000 + 1 + 1000 (500 + 1)² = 251001 3. 30.5 × 29.5 It can be written as (30 + 0.5)(30 - 0.5) (30 + 0.5)(30 - 0.5) = (30)² - (0.5)² (30 + 0.5)(30 - 0.5) = 900 - 0.25 (30 + 0.5)(30 - 0.5) = 899.75

Please answer all this questions.(give me step by step explaination)If you know then only answer,if you don't know leave it. Other wise I will report you.

Answer»

Answer:

Step-by-step explanation:

1. 999 × 999

= 999²

It can be WRITTEN as (1000 - 1)²

(1000 - 1)² = (1000)² +(1)² -2.1000.1

(1000 - 1)² = 10,00,000 + 1 - 2000

(1000 - 1)² = 10,00,001 - 2000

(1000 - 1)² = 9,98,001

2. 501 × 501

= 501²

It can be written as (500 + 1)²

(500 + 1)² = (500)² + (1)² + 2.500.1

(500 + 1)² = 250000 + 1 + 1000

(500 + 1)² = 251001

3. 30.5 × 29.5

It can be written as (30 + 0.5)(30 - 0.5)

(30 + 0.5)(30 - 0.5) = (30)² - (0.5)²

(30 + 0.5)(30 - 0.5) = 900 - 0.25

(30 + 0.5)(30 - 0.5) = 899.75

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