Question

1-) Resolva: (y
2
+ 4y – 5) + (– 3y
2
+ 12y – 1)

Answer 1

Resposta:

$\left(y\cdot \:2+4y-5\right)+\left(-3y\cdot \:2+12y-1\right)\\\\=y\cdot \:2+4y-5-3y\cdot \:2+12y-1\\\\=2y+4y-3\cdot \:2y+12y-5-1\\\\=18y-3\cdot \:2y-5-1\\\\=18y-6y-5-1\\\\=12y-5-1\\\\=12y-6$