2x + 3)(x2− x − 5)
= (2x)(x2 − x − 5) + (3)(x2 − x − 5)
= (2x3 − 2x2 − 10x) + (3x2 − 3x − 15)
= 2x3 + x2 − 13x − 15
This time we could collect together some like terms. There was:
this is where i get mixed how does it end up being addition
(2x + 3)(x2− x − 5)
2x(x2− x − 5) + 3)(x2− x − 5)
(2x3 - 2x2 -10x) + (3x2 - 3x -15)
= (2x)(x2 − x − 5) + (3)(x2 − x − 5)
= (2x3 − 2x2 − 10x) + (3x2 − 3x − 15)
= 2x3 + x2 − 13x − 15
This time we could collect together some like terms. There was:
and−2x2 + 3x2 = x2
−10x − 3x = −13x
this is where i get mixed how does it end up being addition
(2x + 3)(x2− x − 5)
2x(x2− x − 5) + 3)(x2− x − 5)
(2x3 - 2x2 -10x) + (3x2 - 3x -15)