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mathe

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Alex_Lev

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1

Sunday, January 7th 2007, 1:20pm

mathe

ok, peinliche frage aber ich bin mir einfach net mehr sicher, wie man (-1.5*x-7.5)^2 ausrechnet... binomische formel is schon klar aber muss man das 1.5 erst ausklammern oder wie macht man dat nochma?

zecher_grauen__

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Sunday, January 7th 2007, 1:27pm

-1,5x * -1,5x -1,5x*-7,5 -7,5*-1,5x - 7,5 * -7,5
=2,25x²+22,5x+56,25

oder hab ich mich wieder verrechnet? ^^

This post has been edited 1 times, last edit by "zecher_grauen__" (Jan 7th 2007, 1:32pm)

_Icedragon_

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3

Sunday, January 7th 2007, 1:30pm

du musst die binomische formel einfach auf den ausdruck anwenden:
a= -1,5x
b= 7,5
(a-b)=a^2 - 2ab +b^2
-> = 2.25*x^2 + 22.5x + 56.25

This post has been edited 3 times, last edit by "_Icedragon_" (Jan 7th 2007, 1:32pm)

_Icedragon_

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4

Sunday, January 7th 2007, 1:33pm

Quoted

Original von zecher_grauen__
-1,5x * -1,5x -1,5x*-7,5 -7,5*-1,5x - 7,5 * -7,5
=2,25x²+22,5x+56,25

oder hab ich mich wieder verrechnet? ^^

nee diesmal stimmts, es muss ein plus in der mitte sein...

zecher_grauen__

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Sunday, January 7th 2007, 1:34pm

dann bin ich ja beruhigt ;)

Alex_Lev

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6

Sunday, January 7th 2007, 2:04pm

vielen dank!

myabba|abra

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7

Sunday, January 7th 2007, 2:10pm

du kannst auch das (-1,5) aus klammern, welches dann aber auch quadriert werden muss