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3psilon
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SAT help ? In the equation, K and m are constants . If the equation is true for all values of x, what is the value of m?
 one year ago
 one year ago
3psilon Group Title
SAT help ? In the equation, K and m are constants . If the equation is true for all values of x, what is the value of m?
 one year ago
 one year ago

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3psilon Group TitleBest ResponseYou've already chosen the best response.0
\[(x8)(xk) = x^{2} 5kx + m\]
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
simplify the left side: x^2  kx  8x + 8k = x^2  (k+8)x + 8k
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
x^2  (k+8)x + 8k = x^2  5kx + m
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
thus you know that k+8 = 5k
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
and 8k = m
 one year ago

robinfr93 Group TitleBest ResponseYou've already chosen the best response.0
just what bahrom said
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
Now just solve for both.
 one year ago

robinfr93 Group TitleBest ResponseYou've already chosen the best response.0
bahrom mate can ya help me out with a sum of my own??
 one year ago

robinfr93 Group TitleBest ResponseYou've already chosen the best response.0
@bahrom7893
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
@robinfr93 let me see the question
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.0
@bahrom7893 What does it mean by true for all values of x?
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.0
I don't see how you got k+8 = 5k Where did everything else go?
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
it just means equate the two equations.
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
I'm equating the coefficients: x^2  (k+8)x + 8k = x^2  5kx + m
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
dw:1347995814720:dw
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
dw:1347995848017:dw
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
for those two equations to be equal to each other for all x, k+8 has to equal 5k and 8k must equal m
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.0
Could it go the other way around? Like (k+8) = m? @bahrom7893
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
No it couldn't, since x coefficients have to equal to corresponding x coefficients
 one year ago

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
k+8 is coefficient of x^1, and so is 5k both 8k and m are coefficients of x^0
 one year ago

3psilon Group TitleBest ResponseYou've already chosen the best response.0
Ohhhh I see now ok ok thanks
 one year ago
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