magenxoxo
help!? pleaseeee :)
Simplify (6x2+ 11x – 3) + (2x2– 17x – 4)
8x2+ 6x – 1
8x2– 6x – 7
8x2+ 6x + 1
8x2– 6x + 7
How do you simplify these equations?
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timo86m
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add like terms
raden_zaikaria
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6x2+ 11x – 3 + 2x2– 17x – 4
timo86m
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(6x2+ 11x – 3)
+
(2x2 – 17x – 4)
8x^2 -4x -7
Jonask
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\[6x^2+ 11x – 3 + 2x^2– 17x – 4\]
Brad1996
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B I think
Brad1996
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Yeah Its B
Brad1996
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Setting it up like this makes it alot easier:
(6x2+ 11x – 3)
(2x2– 17x – 4)
Brad1996
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6x2 + 2x2 = 8x2
11x - 17x = -6x
-3 - 4 = -7
raden_zaikaria
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6x2+ 2x2=8x2 and 11x – 17x = -6x and – 3 – 4 = -7
timo86m
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(6x2+ 11x – 3)
+
(2x2 – 17x – 4)
8x^2 -6x -7
sorry
raden_zaikaria
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that ansmwer is 8x2-6x-7
magenxoxo
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Thank you! everyone! :) I get it now :)
Brad1996
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Any time
raden_zaikaria
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welcome from malaysia hehe
magenxoxo
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Simplify 2x2(4x2+ 9x – 13)
6x4+ 18x3– 26x2
8x4+ 18x3– 26x2
8x2+ 18x – 26
6x2+ 18x – 26
magenxoxo
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would the answer be D? or A...
Jonask
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none
magenxoxo
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oh........ why?
Jonask
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\[2x^2(4x^2+ 9x – 13)\]
now we are multiplying
Jonask
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so \[2x^2\] should multiply each item in the bracket
magenxoxo
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hmm, so C?
Jonask
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almost there but notice that even the power changes \[2x^2(4x^2)=8x^{4}\]
Jonask
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the powers add each other\[x^a(x^b)=x^{a+b}\]
magenxoxo
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oh. ok. I wasnt sure if i was supposed to change the powers as well.
magenxoxo
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Which of the following represents the area of a rectangle whose length is x – 7 and whose width is
x + 12?
x2+ 5x – 84
x2– 84
x2– 5x – 84
x2– 84x + 5
IS C THE CORRECT ANSWER?
Brad1996
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lol...
magenxoxo
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what?
Jonask
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so did you get the answer to the previous one
magenxoxo
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Yes I did.
Jonask
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you shud ask a new question as a new question
Brad1996
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I'm not 100% sure on this question :l
magenxoxo
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ok,
magenxoxo
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I'll close this question and post a new one so i can give u a medal.