7m^2=168+35m
need help!
can you solve it, if so explain?
MAth question...ALGEBRA?
2009-01-05 5:42 am
回答 (8)
2009-01-05 5:48 am
✔ 最佳答案
7m^2=168+35m7m^2-168-35m = 0
m^2 - 5m - 24 = 0
(m-8)(m+3) = 0--->m = 8, -3
2009-01-05 2:50 pm
7m^2 = 168 + 35m
7m^2 - 35m - 168 = 0
(7m^2 - 35m - 168)/7 = 0/7
m^2 - 5m - 24 = 0
m^2 + 3m - 8m - 24 = 0
(m^2 + 3m) - (8m + 24) = 0
m(m + 3) - 8(m + 3) = 0
(m + 3)(m - 8) = 0
m + 3 = 0
m = -3
m - 8 = 0
m = 8
â´ m = -3 , 8
7m^2 - 35m - 168 = 0
(7m^2 - 35m - 168)/7 = 0/7
m^2 - 5m - 24 = 0
m^2 + 3m - 8m - 24 = 0
(m^2 + 3m) - (8m + 24) = 0
m(m + 3) - 8(m + 3) = 0
(m + 3)(m - 8) = 0
m + 3 = 0
m = -3
m - 8 = 0
m = 8
â´ m = -3 , 8
2009-01-05 1:52 pm
-3, 8
2009-01-05 1:51 pm
okay i don't know if this is how i just gave it my best shot... you want the ms on the same side sooo
35m +168 = 7m^2
or 7m^2 - 35m = 168
get rid of exponent by multiply each factor by 2
168= 2(7m - 35m)
168 = 14m - 70m
then just solve to get m
i'm not sure if it would be 168/56 or 168/ -56
goodluck
35m +168 = 7m^2
or 7m^2 - 35m = 168
get rid of exponent by multiply each factor by 2
168= 2(7m - 35m)
168 = 14m - 70m
then just solve to get m
i'm not sure if it would be 168/56 or 168/ -56
goodluck
2009-01-05 1:51 pm
they've already answered your question, but I just wanted to share this:
My algebra teacher had "the number one rule" and he would shout "Factor out! Factor out! Factor out!". So we always to remember to look for that first thing, because it makes it easier to solve.
My algebra teacher had "the number one rule" and he would shout "Factor out! Factor out! Factor out!". So we always to remember to look for that first thing, because it makes it easier to solve.
2009-01-05 1:49 pm
-3 but I don't feel like explaining..... sorry....
2009-01-05 1:49 pm
7m^2 - 35m - 168 = 0
m^2 - 5m - 24 = 0
(m-8)(m+3) = 0
m = 8 or -3
m^2 - 5m - 24 = 0
(m-8)(m+3) = 0
m = 8 or -3
2009-01-05 1:48 pm
This is a polynomial. You have to bring all the terms on one side and make the other side 0
7m^2=168+35m
7m^2-35m-168 = 0
Factor the answer out.
(x+3)(x-8) = 0
x = -3
x = 8
7m^2=168+35m
7m^2-35m-168 = 0
Factor the answer out.
(x+3)(x-8) = 0
x = -3
x = 8
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