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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?
 2 years ago
 2 years 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?
 2 years ago
 2 years ago

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

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

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

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

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

bahrom7893 Group TitleBest ResponseYou've already chosen the best response.0
Now just solve for both.
 2 years 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??
 2 years ago

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

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

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

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

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

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

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

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