Question

$(x + \frac{2}{5} y)^{3} - (x + \frac{2}{5} y)^{3}$
simplify the above equation....​

Answer 1

Answer:

$= {(x + \frac{2}{5} y})^{3} - {(x + \frac{2}{5} y})^{3} \\ \\ = {x}^{3} + \frac{8}{125} {y}^{3} + \frac{6}{5} {x}^{2} y + \frac{12}{25} x {y}^{2} - ( {x}^{3} + \frac{8}{125} {y}^{3} + \frac{6}{5} {x}^{2} y + \frac{12}{25} x {y}^{2}) \\ \\ = {x}^{3} + \frac{8}{125} {y}^{3} + \frac{6}{5} {x}^{2} y + \frac{12}{25} x {y}^{2} - {x}^{3} - \frac{8}{125} {y}^{3} - \frac{6}{5} {x}^{2} y - \frac{12}{25} x {y}^{2} \: \\ \\ = 0$

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Answer 2

Answer:

In △ABC AB=AC

⇒∠B=∠C (Angles opposite to equal sides are equal)

Now using angle sum property

∠A+∠B+∠C=180

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⇒80

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+∠C+∠C=180

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⇒2∠C=180

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−80

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⇒∠C=

2

100

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=50

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now ∠C+∠x=180

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(Angles made on straight line (AC) are supplementary)

⇒50

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+∠x=180

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⇒∠x=180

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−50

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=130

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