Question 21746
In the first two, you just have to combine like terms:

7a+6b+3a
10a + 6b


4x+2y-1x+3y
3x + 5y


In the next two, you need to remove the parentheses using the distributive property and combine like terms.

8(2a-b-3c)+ 3(2a-b)-4(6-b)
16a -8b -24c + 6a -3b -24 +4b
Combine the a terms:  16a +6a = 22a
Combine the b terms:  -8b -3b +4b = -11b+4b = -7b
There is only one c term and only one number term, so they do not combine!

Final Answer= 22a -7b -24c -24 


On the last problem, I would remove parentheses on the inside first:
{{{4(2a(a+3)+6(4-a))+5a^2}}}

{{{4(2a^2 + 6a + 24 -6a) + 5a^2 }}}


Combine like terms inside the parentheses only:
{{{4(2a^2 + 24) + 5a^2 }}}
{{{8a^2 + 96 + 5a^2}}}


Now, {{{8a^2 + 5a^2}}} are like terms, so they combine {{{13a^2}}}

Final Answer:{{{13a^2 + 96 }}}


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