LonelyandForgotten
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LonelyandForgotten
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|dw:1364852403030:dw|
hartnn
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when denominator is common you can combine the numerator,
\(\huge \dfrac{a}{b}+\dfrac{c}{b}=\dfrac{a+c}{b}\)
LonelyandForgotten
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oh. But why is there a minus sign there. do i have to subtract?
hartnn
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yes, whatever is in numerator, just copy it.
|dw:1364852759481:dw|
got that ^ ?
LonelyandForgotten
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do i have to subtract?
hartnn
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there was -15 in 1st numerator and -22 in 2nd
so, i wrote
-15-22
now to evaluate that, you can factor out - *minus*
so,
-15-22 = - (15+22)
you had to add actually.
sw050399
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It's like if you have: |dw:1364852815238:dw|
Because the denominators are the same, you can just rewrite it as one fraction: |dw:1364852863132:dw|
LonelyandForgotten
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it was 16 not 15
hartnn
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oh, yes, just replace 15 by 16
hartnn
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-(16+22)
LonelyandForgotten
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alrighty, thanks! :D that helps a lot
hartnn
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welcome ^_^