Question

(vii) 8.92 evaluate​

Answer 1

Answer:

vievaluate

i) 712

(ii) 992

(iii) 1022.

(iv) 9982 (v)

5.22 (vi)

297 × 303

(vii) 78 × 82

(viii) 8.92

(ix) 1.05 × 9.5. Sol.

(i) 712. = (70 + 1)2 .

Answer 2

= (9 – 0.1)2

= (9)2 – 2(9)(0.1) + (0.1)2

[Using: (a – b2) = (a2 – 2ab + b2]

= 81 – 1.8 + 0.01 = 79.21