1. a) 7x
b) 5x
c) 3x
d)[tex]11x^{2}[/tex]
e)[tex]11x^{2}[/tex]
f)[tex]2x^{2}[/tex]
g)[tex]-8x^{2}[/tex]
h)[tex]28x^{2}[/tex]
i)[tex]6x^{3}[/tex]
2)5a-2a+6a=3a+6a=9a
b)7a+4a-6a=11a-6a=5a
c)[tex]3a^{2} -27a^{2} +a^{2}[/tex]=[tex]-23a^{2}[/tex]
d)[tex]8a^{2} +3a^{2} -9a^{2} =11a^{2} -9a^{2} =2a^{2}[/tex]
e)[tex]10a^{3}-5a^{3} -8a^{3} =5a^{3} -8a^{3}=-3a^{3}[/tex]
f)[tex]8a^{3} -19a^{3} +15a^{3} =-11a^{3}+15a^{3}=4a^{3}[/tex]
3) a) 5x-6-3x+7=2x+1
b)2x+5-8x-9=-6x-4
c)13-7x-2x-6=7-9x
d)15x-8-5x-1=10x-9
e)11+3x-9-9x=2-6x
f)10+6x-4-8x=6-2x
g)[tex]3x^{2} -6x-7x^{2} +2x=-4x^{2} -4x[/tex]
h)[tex]4x-9x^{2} -5x^{2} -7x=-3x-14x^{2}[/tex]
i)[tex]11x-x^{2} +17x^{2} -5x=6x+16x^{2}[/tex]
