Mathematics
10 Online
OpenStudy (andriod09):
Factor trinominal times a binomial
equation in the comments
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OpenStudy (andriod09):
\[\left( 2x+4y+7 \right)\left( 5x+8 \right)\]
OpenStudy (andriod09):
@ganeshie8
ganeshie8 (ganeshie8):
is it 'factor' or 'multiply' ?
OpenStudy (andriod09):
you have to factor it. but its presented as a multiplication question.
ganeshie8 (ganeshie8):
hmm interesting.. its already in factored form i guess we cant factor it any further
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OpenStudy (andriod09):
i think it might be multiplying it though. the question is:
7.How about multiplying a trinomial times a binomial?
ganeshie8 (ganeshie8):
yea this makes sense :)
ganeshie8 (ganeshie8):
just have to multiply..
ganeshie8 (ganeshie8):
you familiar wid multuplying these right ?
OpenStudy (andriod09):
somewhat
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ganeshie8 (ganeshie8):
\((2x+4y+7)(5x+8)\)
\((\color{green}{2x}+4y+7)(\color{green}{5x+8})\)
ganeshie8 (ganeshie8):
first distribute 2x
ganeshie8 (ganeshie8):
then 4y
and lastly 7
OpenStudy (andriod09):
in between them, would i use ()+()+() or just ()()()?
ganeshie8 (ganeshie8):
thats right ! in between we add. () + () + ()
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ganeshie8 (ganeshie8):
\((\color{green}{2x}+4y+7)(\color{green}{5x+8}) \)
\(10x^2 + 16x + 20xy + 32y + 35x + 56 \)
ganeshie8 (ganeshie8):
see if above makes sense
OpenStudy (andriod09):
\[\left( 10x^{2}+16x \right)+\left( 20xy+24y \right)+\left( 35x+56? \right)\]
ganeshie8 (ganeshie8):
thats almost right !! except for \(24y\)
OpenStudy (andriod09):
i mistyped it. lool. its (20xy+32)
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ganeshie8 (ganeshie8):
right ! now remove ()
ganeshie8 (ganeshie8):
and see if any like terms are there
OpenStudy (andriod09):
16x and 35x and thats it.
ganeshie8 (ganeshie8):
yup :)
ganeshie8 (ganeshie8):
add them and write it in order
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OpenStudy (andriod09):
\[(10x^{2}+51x+20xy+24y+56)\]
ganeshie8 (ganeshie8):
\(\left( 10x^{2}+16x \right)+\left( 20xy+32y \right)+\left( 35x+56? \right) \)
\(10x^{2}+16x +20xy+32y +35x+56 \)
\(10x^{2}+20xy +51x+32y + 56 \)
ganeshie8 (ganeshie8):
again 24y. ...
ganeshie8 (ganeshie8):
if we ignore that 24y mistype, your final polynomial looks good except for one thing
OpenStudy (andriod09):
\[(10x^{2}+51x+20xy+32y+56)\]
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ganeshie8 (ganeshie8):
20xy order is more
ganeshie8 (ganeshie8):
so you have to move it to left,
ganeshie8 (ganeshie8):
and 51x to right.. swap 20xy and 51x