anonymous
  • anonymous
:)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
UsukiDoll
  • UsukiDoll
uhhhhhhhhh we can just plug in those values and solve?!!!
anonymous
  • anonymous
YA I KNOW BUT EVERY TIME I MESS UP -_- AND I NEED HELP PLEASE!
UsukiDoll
  • UsukiDoll
\[2r^2+3s^3-r^2+4t^2-r^2\] \[-3a^2-b^3+3c^2-2b^3\]

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More answers

funnyguy2
  • funnyguy2
19 http://www.mathpapa.com/algebra-calculator.html
UsukiDoll
  • UsukiDoll
well ok.. we can combine like terms first to make it easier \[2r^2-r^2-r^2+3s^3+4t^2\] \[2r^2-2r^2+3s^3+4t^2\] \[3s^3+4t^2\] s=-3 t=5 \[3(-3)^3+4(5)^2\] \[3(-27)+4(25)\] \[-81+100=19\]
UsukiDoll
  • UsukiDoll
yup checks out on the first one I got 19 too, but at least I showed work :P
anonymous
  • anonymous
The second question too i am confused on can you help with that too?
anonymous
  • anonymous
Find −3a2 − b3 + 3c2 − 2b3 if a = 2, b = −1, and c = 3.
UsukiDoll
  • UsukiDoll
\[-3a^2-3b^3+3c^2\] a=2, b=-1, c = 3 \[-3(2)^2-3(-1)^3+3(3)^2\] \[-3(4)-3(-1)+3(9)\] \[-12+3+27 =18\]
anonymous
  • anonymous
Thank you!
funnyguy2
  • funnyguy2
Thank who?
funnyguy2
  • funnyguy2
I would thank the creator of the algebra calculator.
UsukiDoll
  • UsukiDoll
^which you shouldn't depend on.. because that's not really learning how to solve these problems.
funnyguy2
  • funnyguy2
It shows you the steps!
UsukiDoll
  • UsukiDoll
True, but if OP has a closed book closed note test... then what? The only way to solve it is the manual way.
UsukiDoll
  • UsukiDoll
these sites that automatically solve the problem for you are only supposed to be used to check your answer... it shouldn't be a replacement to do the math the pencil and paper way.
skullpatrol
  • skullpatrol
@cutiiepie7272 you must learn to replace each variable with a given value and simplify the resulting numerical expression.
skullpatrol
  • skullpatrol
Any questions?
skullpatrol
  • skullpatrol
This is called the substitution principle: An expression maybe replaced by another expression that has the same value.
skullpatrol
  • skullpatrol
4 + 2 can be replaced by 6 because they have the same value 4 + 2 = 6. Similarly, if x = 6, then x can be replaced by 6 because they have the same value 6 = 6.
skullpatrol
  • skullpatrol
Also, please use the "^" symbol for exponentiation :-)

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