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2. 42m+20n+9)-(50m-20n+9)=42m+35n+7-(50m-20n+9)=-8m+55n-2
3. (2x-2)(x+5)=2x*x+2x*5+-2*x+-2*5=2x^2+10x-2x-10=2x^2+8x-10=2*(x+5)*(x-1)
-8b+9b=b
jadi hasilnya 25a+b
2. 42m-50m=-8m
35n+20n= 55n
7-9=-2
jadi hasilnya -8m+55n-2
3. 2x²+10x-2x+5=2x²+8x+5