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Mathematics 7 Online
OpenStudy (anonymous):

can someone explain this process of simplifying in more detail. I'm so confused

OpenStudy (anonymous):

OpenStudy (anonymous):

especially from the first to second step .. thanks

OpenStudy (anonymous):

@hartnn

hartnn (hartnn):

its just factoring out common terms

OpenStudy (anonymous):

but how though

OpenStudy (anonymous):

how did the (3x+4)^5 and (3x+4)^4 become (3x+4)^4 and (3x+4)^1

OpenStudy (anonymous):

from the first step to the second

hartnn (hartnn):

\(\Large a^5 +a^4 = a^4 (a+1)\)

hartnn (hartnn):

thats what is done with 3x+4 terms a=3x+4

OpenStudy (anonymous):

hmm let me think about it for a it and ill get back to u :P

hartnn (hartnn):

sure :)

OpenStudy (anonymous):

so if it was (3x+4)^5 and (3x+4)^3.. how do we factor out the like term

hartnn (hartnn):

we would have factored OUT (3x+4)^3 so, (3x+4)^5 would have become (3x+4)^2

hartnn (hartnn):

and (3x+4)^3 would have become 1 (3x+4)^3 [(3x+5)^2 + 1]

hartnn (hartnn):

(3x+4)^2 i mean***

OpenStudy (anonymous):

sorry I'm confused :P

hartnn (hartnn):

\(\large ☻☺+☻♥= ☻(☺+♥) \\ \text{this is factoring, } \\ \text{☻ was common from both terms and factored out.}\)

hartnn (hartnn):

you have something like \(a (3x+4)^5 + b (3x+4)^4\) right?? a,b are some functions of x which we are not concerned with now.. your doubts is how do we get to here : \(a (3x+4)^5 + b (3x+4)^4 = (3x+4)^4 [a (3x+4) +b]\) right ?

OpenStudy (anonymous):

yes

hartnn (hartnn):

\(\Large (3x+4)^5 = (3x+4)^4 \times (3x+4)\)

OpenStudy (anonymous):

oh yea because the if u add the exponents 4+1 it is equal to 5

hartnn (hartnn):

YES, thats correct. \(a (3x+4)^5 + b (3x+4)^4 = a (3x+4)^4 (3x+4) + b (3x+4)^4\) n0w (3x+4)^4 is common! and can be factored out

OpenStudy (anonymous):

oh ok and same goes with (x^3-x+2) in the same question i gave

hartnn (hartnn):

yes, correct

OpenStudy (anonymous):

(x^3-x+2)^2=(x^3-x+2)^1+(x^3-x+2)^1

hartnn (hartnn):

\((x^3-x+2)^2=(x^3-x+2)^1\times (x^3-x+2)^1\)

hartnn (hartnn):

\(a^2 = a \times a\) not a+a

OpenStudy (anonymous):

ph yes sorry ... thanks a lot

OpenStudy (anonymous):

oh*

hartnn (hartnn):

ask if any more doubts :) welcome ^_^

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