Question

evaluate the following by using algebraic identity (a) 9.9square

Answer 1

Answer:

(9.9)^2 = (100+1)^2

100² +2×100×1+2²

10000 +200+4 = 10204

Answer 2

Answer:

98.01

Step-by-step explanation:

$9.9^{2}\\10-0.1^{2}\\10^{2}+0.1^{2}-2*10*0.1\\100+0.01-2*10*\frac{1}{10}\\ 100+0.01-2\\100.01-2\\98.01$

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