<PRE><B>Question 251756</B>


{{{4y^2+16y+16}}} Start with the given expression.



{{{4(y^2+4y+4)}}} Factor out the GCF {{{4}}}.



Now let&#39;s try to factor the inner expression {{{y^2+4y+4}}}



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Looking at the expression {{{y^2+4y+4}}}, we can see that the first coefficient is {{{1}}}, the second coefficient is {{{4}}}, and the last term is {{{4}}}.



Now multiply the first coefficient {{{1}}} by the last term {{{4}}} to get {{{(1)(4)=4}}}.



Now the question is: what two whole numbers multiply to {{{4}}} (the previous product) &lt;font size=4&gt;&lt;b&gt;and&lt;/b&gt;&lt;/font&gt; add to the second coefficient {{{4}}}?



To find these two numbers, we need to list &lt;font size=4&gt;&lt;b&gt;all&lt;/b&gt;&lt;/font&gt; of the factors of {{{4}}} (the previous product).



Factors of {{{4}}}:

1,2,4

-1,-2,-4



Note: list the negative of each factor. This will allow us to find all possible combinations.



These factors pair up and multiply to {{{4}}}.

1*4 = 4
2*2 = 4
(-1)*(-4) = 4
(-2)*(-2) = 4


Now let&#39;s add up each pair of factors to see if one pair adds to the middle coefficient {{{4}}}:



&lt;table border=&quot;1&quot;&gt;&lt;th&gt;First Number&lt;/th&gt;&lt;th&gt;Second Number&lt;/th&gt;&lt;th&gt;Sum&lt;/th&gt;&lt;tr&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=black&gt;1&lt;/font&gt;&lt;/td&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=black&gt;4&lt;/font&gt;&lt;/td&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=black&gt;1+4=5&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=red&gt;2&lt;/font&gt;&lt;/td&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=red&gt;2&lt;/font&gt;&lt;/td&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=red&gt;2+2=4&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=black&gt;-1&lt;/font&gt;&lt;/td&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=black&gt;-4&lt;/font&gt;&lt;/td&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=black&gt;-1+(-4)=-5&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=black&gt;-2&lt;/font&gt;&lt;/td&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=black&gt;-2&lt;/font&gt;&lt;/td&gt;&lt;td  align=&quot;center&quot;&gt;&lt;font color=black&gt;-2+(-2)=-4&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;



From the table, we can see that the two numbers {{{2}}} and {{{2}}} add to {{{4}}} (the middle coefficient).



So the two numbers {{{2}}} and {{{2}}} both multiply to {{{4}}} &lt;font size=4&gt;&lt;b&gt;and&lt;/b&gt;&lt;/font&gt; add to {{{4}}}



Now replace the middle term {{{4y}}} with {{{2y+2y}}}. Remember, {{{2}}} and {{{2}}} add to {{{4}}}. So this shows us that {{{2y+2y=4y}}}.



{{{y^2+highlight(2y+2y)+4}}} Replace the second term {{{4y}}} with {{{2y+2y}}}.



{{{(y^2+2y)+(2y+4)}}} Group the terms into two pairs.



{{{y(y+2)+(2y+4)}}} Factor out the GCF {{{y}}} from the first group.



{{{y(y+2)+2(y+2)}}} Factor out {{{2}}} from the second group. The goal of this step is to make the terms in the second parenthesis equal to the terms in the first parenthesis.



{{{(y+2)(y+2)}}} Combine like terms. Or factor out the common term {{{y+2}}}



{{{(y+2)^2}}} Condense the terms.



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So {{{4(y^2+4y+4)}}} then factors further to {{{4(y+2)^2}}}



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Answer:



So {{{4y^2+16y+16}}} completely factors to {{{4(y+2)^2}}}.



In other words, {{{4y^2+16y+16=4(y+2)^2}}}.



Note: you can check the answer by expanding {{{4(y+2)^2}}} to get {{{4y^2+16y+16}}} or by graphing the original expression and the answer (the two graphs should be identical).
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