Question

resolva ? 2x⁴+5x³-12x+7 por x-1

Answer 1

+2x⁴+5x³+0x²-12x+7. ( x - 1 ) 
-2x⁴+2x³
=2x³+7x²+7x-... 
 =7x³+0x² 
=-7x³+7x² 
= 7x²-12x 
= -7x²+7x 
= 5x+7 
= +5x-5 
= +2 

Portanto: 2x⁴+5x³-12x+7 =(x-1)(2x³+7x²+7x-5)+2