Question

Find the square of the following using formula
a) 4 a + b
b) 2a - 7b
​

Answer 1

Answer:

(4a + b)² = 16a² + 8ab + b²

(2a - 7b)² = 4a² - 14ab + 49b²

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Answer 2

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Given -

• 4a+ b
• 2a - 7b

To find -

• Square of this

Solution -

using identity (a+ b)^2 = a^2 + b^2 + 2ab

i) (4a+ b)^2

4a^2 + b^2 + 2(4a)(b)

16a^2 + b^2 + 8ab

ii) (2a- 7b)^2

2a^2 + 7b^2 - 2( 2a) (7b)

4a^2 + 49b^2 - 28ab

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