Answer:
Simplified form of the first equation: [tex]5a-3b-10c[/tex]
Simplified form of the second equation: [tex]5x^{2} y+5xy^{2}[/tex]
Step-by-step explanation:
For (3a+2b-c) + (2a-5b-9c), first remove the unnecessary parentheses:
3a + 2b - c + 2a - 5b - 9c
Collect like terms (3a and 2a, 2b and -5b, -9c and -c):
5a-3b-10c
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For (12x2y-7xy2)+(12xy2-7x2y), first remove the unnecessary parentheses:
12x2y-7xy2+12xy2-7x2y
Collect like terms (12x2y and -7x2y, -7xy2 and 12xy2):
5x2y + 5xy2
Hope this is what you needed and it helps.
