Question

упростите вырожние 7х²-2х+(5+11х+6х²)

Answer 1

$7x^2-2x+(5+11x+6x^2)=$
$7x^2-2x+5+11x+6x^2=$
$(7x^2+6x^2)+(11x-2x)+5=$
$(7+6)x^2+(11-2)x+5=$
$13x^2+9x+5$