## anonymous 4 years ago Multiply: (x + 1)(x - 2).

1. myininaya

$x(x-2)+1(x-2)$

2. myininaya

I use the distributive property twice

3. myininaya

now you do it twice again

4. anonymous

Each value in each group should be multiplied by each value in the other group: $(x \times x) + (x \times -2) + (1 \times x) + (1 \times -1)$

5. anonymous

I think it's x^2 - 2x - 2

6. myininaya

$-2x+1x=(-2+1)x \neq -2x$

7. anonymous

What?

8. myininaya

(-2+1) is not -2

9. anonymous

x^2-2

10. myininaya

$x(x-2)+1(x-2)=(x^2-2x)+(x-2)=x^2+x(-2+1)-2$

11. anonymous

2x-2

12. anonymous

You can use the FOIL method (x + 1)(x - 2) Use the FOIL method to get the product F = Multiply the First numbers x * x = x^2 O= Multiply the Outer numbers x * -2 = -2x I = Multiply the Inner numbers 1 * x = x L = Multiply the Last numbers 1 * -2 = -2 Now put it together x^2 - 2x +x -2 Combine like terms x^2 - x -2

13. anonymous

Thanks! :)