Which of the following is the correct expansion of (3x-y)2

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Ответ:

sarbjit879

11.05.2021

Mathematics

Step-by-step explanation:

Let us represent the number as x. In a similar sense, half the number would be $\frac{x}{2}$ . We know that their sum is 30, so we can write the following equation:

$x+\frac{x}{2} =30\\2x+x=60\\3x=60\\\fbox{x=20}$

I hope this helps! Let me know if you have any questions :)

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