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3 years ago

14

Easy question!!

xFormula1" title="3 - \frac{2y}{5} = 1 \frac{4}{5} " alt="3 - \frac{2y}{5} = 1 \frac{4}{5} " align="absmiddle" class="latex-formula">
solve for Y

2 answers:

nikdorinn [45]3 years ago

7 0

<em>So</em><em> </em><em>the</em><em> </em><em>right</em><em> </em><em>answer</em><em> </em><em>is</em><em> </em><em>3.</em>

<em>Look</em><em> </em><em>at</em><em> </em><em>the</em><em> </em><em>attached</em><em> </em><em>picture</em>

<em>H</em><em>ope</em><em> </em><em>it</em><em> </em><em>will</em><em> </em><em>help</em><em> </em><em>you</em>

VLD [36.1K]3 years ago

4 0

Answer:

the answer is attached to the picture

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Expand $(x+1)(x^{2}+1)(x-1)$. What is the sum of the coefficients of the resulting expression?

defon

Answer:

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Step-by-step explanation:

Hello, please consider the following.

For any a and b real numbers we can write.

$(a-b)(a+b)=a^2-b^2$

We apply this formula two times here, as below.

$(x+1)(x^{2}+1)(x-1)=(x+1)(x-1)(x^{2}+1)\\\\=(x^2-1^2)(x^2+1)=(x^2-1)(x^2+1)\\\\=(x^2)^2-1^2=x^4-1$

We have the coefficient of 1 for $x^4$ and the constant term is -1, so the sum of the coefficients is 0.

Thank you.

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Step-by-step explanation:

Step 1:

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Step 2:

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Answer:

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