Question

add x³-2x²-9,5x²+2x+9​

Answer 1

Answer:

=x³+3x²+2x

Step-by-step explanation:

x³- 2x²- 9 + 5x²+ 2x+ 9

=x³+3x²+2x

Answer 2

Answer:

$→( {x}^{3} - 2 {x}^{2} - 9) + (5 {x}^{2} + 2x + 9) \\ = ({x}^{3})+ ( - 2 {x}^{2} + 5 {x}^{2} ) +( 2x) + ( - 9 + 9) \\ = \boxed{ {x}^{3} + 3 {x}^{2} + 2x}✓$

• x³+3x²+2x is the right answer.