Answer :
2x-8y+3x^2+7y-12x
2x-12x-8y+7y+3x^2 ( combine like terms)
2x-12x= -10x
-8y+7y=-y
Answer: 3x^2-10x-y or 3x^ 2-y-10x
[tex]\huge\boxed{\bf\underline{{Question:—}}}[/tex]
[tex]\sf \longmapsto \: 2x-8y+3x^2+7y-12x[/tex]
[tex]\boxed{\huge{{\bf\underline{Solution:—}}}}[/tex]
[tex] \boxed{{{\bf Simplifying:—}}}[/tex]
[tex]\sf \longmapsto2x+−8y+3x2+7y+−12x[/tex]
[tex]\boxed{\bf Combining \: Like \: Terms:—}[/tex]
[tex]\sf \longmapsto2x+−8y+3x^2+7y+−12x[/tex]
[tex]\sf \longmapsto(3 {x}^{2} )+(2x+−12x)+(−8y+7y)[/tex]
[tex]\sf \longmapsto3 {x}^{2} +−10x+−y[/tex]
[tex]\sf \longmapsto \: 3 {x}^{2} - 10x - y[/tex]
[tex] \boxed{\bf \: Answer:—}[/tex]
[tex] \boxed{\sf \underline{ 3 {x}^{2} −10x−y}}[/tex]
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[tex]\bf{@Brian}[/tex]