NCERT - Mathematics

Book: NCERT - Mathematics

Chapter: 9. Algebraic Expressions and Identities

Subject: Maths - Class 8th

Q. No. 1 of Exercises 9.5

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1

Use a suitable identity to get each of the following products.

(i)


(ii)


(iii)


(iv)


(v)


(vi)


(vii)


(viii)


(ix)


(x)

(i) Using Identity (a + b)2 = a2 + 2ab + b2



In the given expression a = x, b = 3


On substituting these values in the above identity, we get




(ii) Using Identity (a + b)2 = a2 + 2ab + b2



In the given expression a = 2y, b = 5


On substituting these values in the above identity, we get




(iii) Using Identity (a - b) 2 = a2 - 2ab + b2



In the given expression a = 2a, b = 7


On substituting these values in the above identity, we get




(iv) Using Identity (a - b)2 = a2 - 2ab + b2



In the given expression a = 3a, b = 1/2


On substituting these values in the above identity, we get




(v) Using Identity (a + b)(a - b) = a2 - b2



In the given expression a = 1.1m, b = 0.4


On substituting these values in the above identity, we get




(vi) Using Identity (a + b)(a - b) = a2 - b2



In the given expression a = b2, b = a2


On substituting these values in the above identity, we get




(vii) Using Identity (a + b)(a - b) = a2 - b2



In the given expression a = 6x, b = 7


On substituting these values in the above identity, we get




(viii)Using Identity (a - b) 2 = a2 - 2ab + b2


On substituting these values in the above identity, we get




(ix) Using Identity (a + b) 2 = a2 + 2ab + b2



In the given expression a =


On substituting these values in the above identity, we get




(x) Using Identity (a - b) 2 = a2 - 2ab + b2



In the given expression a =


On substituting these values in the above identity, we get




1

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