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korosh23
 one year ago
Precalculus 12 question!
korosh23
 one year ago
Precalculus 12 question!

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Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1well, the height of the rectangle is given by the equation y = 9  x^2 and the width is 2x

korosh23
 one year ago
Best ResponseYou've already chosen the best response.0I know how to get the area, but how do you know the height?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1well, think of it this way: on the xy coordinate plane, the x value tells you how far to the right or left to go, and the yvalue tells you how far up or down to go, correct? since we want the height of the rectangle, it naturally follows that we want the y value

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1so, we're given the equation y = 9  x^2, so that's our height

korosh23
 one year ago
Best ResponseYou've already chosen the best response.0but the height of the rectangle is far smaller than the original prabola

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1nope, not necessarily, remember that x is not a fixed value if we make x something super small, like 0.00001, then the height of the rectangle is almost the height of the parabola the point is that x changes

korosh23
 one year ago
Best ResponseYou've already chosen the best response.0ok I got this, and about the width, it looks like 4x to me. How is it 2x?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1well, think of it this way. let's try splitting the rectangle in half down the yaxis, like this: dw:1440359170630:dw

korosh23
 one year ago
Best ResponseYou've already chosen the best response.0Oh I see :) Yes and as we know negative value does not have any meaning in area.

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1nope, that's not quite the point I was getting at...

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1dw:1440359429185:dw would you agree that the distance marked is equal to x?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1so, all we have to do now is add the other half of the rectangle back in. dw:1440359485663:dw

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1making our width equal to 2x

korosh23
 one year ago
Best ResponseYou've already chosen the best response.0Everything is good. Thank you for clarifying this to me @Vocaloid
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