Question

evaluate, using suitable identity: 1) 2.07*1.93
solve it​

Answer 1

Answer:

(a+b)(a-b) = a^2 - b^2 is the suitable identity

$2.07 = 2 + .07$

$1.93 = 2 - .07$

$2.07 \times 1.93 \\ = (2 + .07)(2 - .07) \\ = {2}^{2} - {.07}^{2} \\ = 4 - .0049 \\ = 3.9951$

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