Question

evaluate 10.2x9.8 by suitable identity.​

Answer 1

Answer:

10.2×9.8 = (10+.2)(10-.2) = (10^2) - (.2^2) = (100 - .04) =

GIVES YOU :)

99.96

Answer 2

Answer:

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

(i) (x + 3) (x + 3)

(ii) (2y + 5) (2y + 5)

(iii) (2a – 7) (2a – 7)

iv) (3a-1/2)(3a-1/2)

(v) (1.1m – 0.4) (1.1m + 0.4)

(vi) (a2+ b2) (– a2+ b2)

(vii) (6x – 7) (6x + 7)

(viii) (– a + c) (– a + c)

ix) [ (x/2)+(3y/4)] [ (x/2)+(3y/4)]

(x) (7a – 9b) (7a – 9b)