Using find (i) (ii) (iii) (iv)

NCERT - Mathematics

Book: NCERT - Mathematics

Chapter: 9. Algebraic Expressions and Identities

Subject: Maths - Class 8^th

Q. No. 7 of Exercises 9.5

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7

Using find
(i)

(ii)

(iii)

(iv)

(i) 51² - 49² =

Using Identity

Here a = 51, b = 49

(ii) (1.02)² - (0.98) ²

Using Identity

Here a = 1.02, b = 0.98

(iii) (153)² - (147)²

Using Identity

Here a = 153, b = 147

(iv) (12.1) ² - (7.9) ²

Using Identity

Here a = 12.1, b = 7.9

7

Chapter Exercises

Exercises 9.1

Exercises 9.2

Exercises 9.3

Exercises 9.4

Exercises 9.5

1

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

(ii)

(iii)

(iv)

(v)

(vi)

(vii)

(viii)

(ix)

(x)

2

Use the identity to find the following products.
(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii)

1

Find the following squares by using the identities.
(i)

(ii)

(iii)

(iv)

(v)

(vi)

4

Simplify.
(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii)(m² - n²m) ² + 2m³n²

(viii)

5

Show that.
(i)

(ii)

(iii)

(iv)

(v)

6

Using identities, evaluate.
(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii)

(viii)

(ix)

7

Using find
(i)

(ii)

(iii)

(iv)

8

Using find
(i) 1

(ii)

(iii)

(iv)