Math, asked by surahkgd, 1 year ago

using the identity (x+a) (x+b) =x^2+(a+b) x + ab find
(a) 9.2 x 9.9

Answers

Answered by indusinghkancha
1
9.2×9.9
=(9+.2)(9+.9)
Since,
(X+a)(x+b)=x²+(a+b)x+ab
:.9²+(.9+.2)9+.2×.9
=81+9.9+.18
=91.08
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Answered by Bianchi
3
9.2 \times 9.9 = (9 + 0.2)(9 + 0.9) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = {(9)}^{2} + (0.2 + 0.9) \times 9 + (0.2 \times 0.9) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 81 + 1.1 \times 9 + 1.8 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 81 +9.9 +.18 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 91.08
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