Mathematics
21 Online
OpenStudy (anonymous):
can someone help?
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OpenStudy (boldjon):
with?
OpenStudy (anonymous):
solve for x: −2(x + 3) = −2(x + 1) − 4.
I need help, not the answer please
OpenStudy (mehek.15):
do you know how to distribute?
OpenStudy (anonymous):
no ;-;
OpenStudy (mehek.15):
|dw:1451951600494:dw|
multiply the number on the outside with everything in the parenthesis
so
-2 * x =
-2 * 3 =
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OpenStudy (anonymous):
I don't understand? is it 6?
OpenStudy (anonymous):
-2 x 3 + 6?
OpenStudy (anonymous):
=*
OpenStudy (mehek.15):
-2 * x = -2x
-2 * 3 = -6 not +6
OpenStudy (anonymous):
oh. okay
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OpenStudy (mehek.15):
negative * negative = positive
positive * positive = positive
negative * positive = negative
OpenStudy (anonymous):
:)
so what's the next step?
OpenStudy (mehek.15):
well we got one side
-2x -6 = -2(x+1)-4
now distribute on other side
-2(x+1)
-2 * x =
-2 * 1 =
OpenStudy (anonymous):
-2?
OpenStudy (mehek.15):
-2 * x = -2x
-2 * 1 = -2
-2x - 6 = -2x - 2 - 4
-2 - 4 = ?
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OpenStudy (anonymous):
-2
OpenStudy (anonymous):
right?
OpenStudy (mehek.15):
no
-2 - 4 is the same as 2 + 4 but with a negative sign in the answer
-2 - 4 = -6
OpenStudy (anonymous):
oh
OpenStudy (anonymous):
alright
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OpenStudy (mehek.15):
-2x - 6 = - 2x - 6
OpenStudy (mehek.15):
both sides are exactly the same
notice that?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
do i add 6 to each side now? so I can get the x alone
OpenStudy (mehek.15):
so that means the solution is infinite
meaning you can put any value for `x` since both sides are the same
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OpenStudy (mehek.15):
@summerr no need to get x alone because both sides are the same
so when you solve, it's going to be 0 = 0