Respuesta:
Explicación paso a paso:
a) 9x-19-[tex]10x^{2}[/tex]+20+[tex]15x^{2}[/tex]+6x-1-15x=
-[tex]10x^{2}[/tex] + [tex]15x^{2}[/tex]+9x+6x+15x-19-1
[tex]5x^{2}[/tex] + 30x-20
b) 8n-16m-20-14m-8-8n=
8n-8n-16m-14m-20-8
-30m-28
c) a+7b+9a-b+12-15a+4b
a+9a-15a+7b-b+4b+12
-5a+10b+12
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Verified answer
Respuesta:
Explicación paso a paso:
a) 9x-19-[tex]10x^{2}[/tex]+20+[tex]15x^{2}[/tex]+6x-1-15x=
-[tex]10x^{2}[/tex] + [tex]15x^{2}[/tex]+9x+6x+15x-19-1
[tex]5x^{2}[/tex] + 30x-20
b) 8n-16m-20-14m-8-8n=
8n-8n-16m-14m-20-8
-30m-28
c) a+7b+9a-b+12-15a+4b
a+9a-15a+7b-b+4b+12
-5a+10b+12