Question

formulas of 1st to 8th standard​

Answer 1

Answer:

Maths Formulas For Class 8: Algebraic Identity

(a + b)2 = a2 + 2ab + b2

(a – b)2 = a2 – 2ab + b2

(a + b) (a – b) = a2 – b2

(x + a) (x + b) = x2 + (a + b)x + ab.

(x + a) (x – b) = x2 + (a – b)x – ab.

(x – a) (x + b) = x2 + (b – a)x – ab.

(x – a) (x – b) = x2 – (a + b)x + ab.

(a + b)3 = a3 + b3 + 3ab(a + b)

Answer 2

Answer:

1 . (a + b)2 = a2 + 2ab + b2

2 . (a – b)2 = a2 – 2ab + b2

3 . (a + b) (a – b) = a2 – b2

4 . (x + a) (x + b) = x2 + (a + b)x + ab

5 . (x + a) (x – b) = x2 + (a – b)x – ab

6 . (x – a) (x + b) = x2 + (b – a)x – ab

7 . (x – a) (x – b) = x2 – (a + b)x + ab

8 . (a + b)3 = a3 + b3 + 3ab(a + b)

9 . (a – b)3 = a3 – b3 – 3ab(a – b)