Question

Evaluate using the following identity-
(a-b) (a^2 + ab + b^2)=a^3 - b^3

and choose the correct option.

Please send correct answers.​

Answer 1

Answer:

a=10/9

Step-by-step explanation:

as we know that the formula

${a}^{3} - {b}^{3} = (a - b)( {a}^{2} + ab + {b}^{2} ) \\ \\ let \: a = 1.2 \: and \: b = 0.3 \: \\ \: the \: abhve \: equation \: become \: \\ \frac{{a}^{2} + ab + {b}^{2}}{ {a}^{3} - {b}^{3} } = \frac{1}{a - b} \\ = \frac{1}{1.2 - 0.3} = \frac{1}{0.9} = \frac{1}{ \frac{9}{10} } = \frac{10}{9}$