expand: 1)(⅔a+1)³
2) (5x-3y)³
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Step-by-step explanation:
1. (⅔a+1)³
soln,
= (⅔a)³ + 3.(⅔a)².1 + 3.⅔a.1² + 1³
= 8a³/27 + 12a²/9 + 6a/3 +1
2. (5x-3y)³
soln,
= (5x)² - 3.(5x)².3y + 3.5x.(3y)² - (3y)³
= 25x² - 225x²y + 135xy² - 27y³
Note : Just apply formula of (a+b)³ and (a-b)³
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