You are missing expression..
But if you simplify you can find the answer (given below)
Answer:
[tex]2x^2-3x-1[/tex]
Step-by-step explanation:
[tex]10x^2+\left(6x-8x^2\right)+3-\left(9x+4\right)[/tex]
[tex]\mathrm{Apply\:rule}:\quad \:a+\left(b+c\right)=a+b+c[/tex]
[tex]10x^2+\left(6x-8x^2\right)=10x^2+6x-8x^2[/tex]
[tex]=10x^2+6x-8x^2+3-\left(9x+4\right)[/tex]
[tex]\mathrm{Group\:like\:terms}[/tex]
[tex]=-\left(9x+4\right)+10x^2-8x^2+6x+3[/tex]
[tex]\mathrm{Add\:similar\:elements:}\:10x^2-8x^2=2x^2[/tex]
[tex]=-\left(9x+4\right)+2x^2+6x+3[/tex]
[tex]\mathrm{Apply\:the\:distributive\:law}:\quad \:-\left(a+b\right)=-a-b[/tex]
[tex]-\left(9x+4\right)=-9x-4[/tex]
[tex]=-9x-4+2x^2+6x+3[/tex]
[tex]\mathrm{Group\:like\:terms}[/tex]
[tex]=2x^2-9x+6x-4+3[/tex]
[tex]\mathrm{Add\:the\:numbers:}\:-4+3=-1[/tex]
[tex]=2x^2-9x+6x-1[/tex]
[tex]\mathrm{Add\:similar\:elements:}\:-9x+6x=-3x[/tex]
[tex]=2x^2-3x-1[/tex]
Answer = [tex]2x^2-3x-1[/tex]
~Learn with Lenvy~
