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Mathematics 10 Online
OpenStudy (andriod09):

Factor trinominal times a binomial equation in the comments

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

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

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. () + () + ()

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)

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

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):

\[(10x^{2}+51x+20xy+32y+56)\]

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

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