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Mathematics 7 Online
OpenStudy (mathmath333):

Prove

OpenStudy (mathmath333):

\(\large \color{black}{\begin{align} & \normalsize \text{Prove the area of the region enclosed by the graph }\hspace{.33em}\\~\\ & y=-|x\pm k|+5,y=0\hspace{.33em}\\~\\ & \normalsize \text{ is constant for} \ \ k,\ k\in \mathbb{R}\ \hspace{.33em}\\~\\ \end{align}}\)

ganeshie8 (ganeshie8):

I'm finding it hard to visualize... could you show the area in graph ?

OpenStudy (mathmath333):

https://www.desmos.com/calculator/ylkcvfm5ss

ganeshie8 (ganeshie8):

Ahh that should be easy

ganeshie8 (ganeshie8):

First of all, we acknowledge that the the absolute value gives the distance between two points on number line: |dw:1434119749216:dw|

OpenStudy (perl):

You can prove it using calculus. The integral of that is constant.

ganeshie8 (ganeshie8):

In light that of above thing, \(|x-k|\) represents the distance between \(x\) and \(k\).

ganeshie8 (ganeshie8):

Set the given function equal to \(0\) and solve \(x\) intercepts : \[-|x-k|+5=0 \implies |x-k|=5\]

OpenStudy (mathmath333):

x=5+k.-5+k

ganeshie8 (ganeshie8):

Yes, subtract them to get the base of triangle

OpenStudy (mathmath333):

base->10

ganeshie8 (ganeshie8):

|dw:1434120100063:dw|

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