SOLUTION: how do i add and/or subtract polynomials? ex:: (5x-12)-(2x-7) ex:: (24m-13)-(18m+7)+(6m-4) Please help me solve these, i would very much apriciate it. thank you

Question 71431: how do i add and/or subtract polynomials?
ex:: (5x-12)-(2x-7)
ex:: (24m-13)-(18m+7)+(6m-4)
Please help me solve these, i would very much apriciate it. thank you
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Adding/subtracting polynomials:
(5x-12)-(2x-7) First remove the parentheses.
5x-12-2x+7 Notice the change of sign from - to + on the last term. Now group like-terms together.
5x-2x-12+7 Now combine the like-terms. (5x-2x)=3x and (-12+7) = -5
3x-5
(24m-13)-(18m+7)+(6m+4) Remove the parentheses and remember to change the signs of those terms with a negative sign in front of the parentheses.
24m-13-18m-7+6m+4 Now group like-terms together.
24m-18m+6m-13-7+4 Now combine like terms. (24m-18m+6m) = 6m and (-13-7+4) = -16
12m-16 This can also be written as: 4(3m-4)

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