## mckenzieandjesus one year ago Find the missing coefficient. (4d-4)(3d-2)= 12d^2 + blank d+8

1. mckenzieandjesus

4 –20 –4 20

2. arivillafana

LHS = (4d-4)(3d-2) = (4d)(3d) + (4d)(-2) + (-4)(3d) + (-4)(-2) = 12d^2 – 8d – 12d +8 = 12d^2 – 20d + 8 ------ (1) But RHS = 12d^2 + _d + 8 ---------(2) Therefore from (1) and (2), Missing Coefficient is -20.

3. anonymous

hint: expand and simplify the left-hand-side

4. calculusxy

Use the FOIL method.

5. mckenzieandjesus

$\left( 4d-4 \right)\left( 3d-2 \right)=12d^2+[blank]d + 8$

6. arivillafana

I just gave her the answer and everyone is ignoring it lol

7. anonymous

yes, so expand and simplify the left-hand-side it'd end up in a quadratic, and you'd see the middle term :)

8. calculusxy

$(4d-4)(3d-2) = 4d(3d) \times 4d(-2) \times -4(3d) \times -4(-2)$

9. calculusxy

I am pretty sure that this is the foil method right?

10. calculusxy

|dw:1444262337064:dw|

11. mckenzieandjesus

what do u mean by expand?

12. mckenzieandjesus

oh okay

13. mckenzieandjesus

Thank you guys!

14. calculusxy

15. mckenzieandjesus

Yes well @arivillafana gave it to me

16. mckenzieandjesus

Could u help me with this question? Match the expression with its name. 3x3 – 3x + 3 quadratic binomial cubic trinomial fourth-degree monomial not a polynomial

17. arivillafana

cubic

18. mckenzieandjesus

Are u sure?

19. mckenzieandjesus

I have a great grade right now & just dont wanna loose it haha

20. arivillafana

that's what i think the expression has 3 terms a leading term with a power of 3 is a cubic

21. mckenzieandjesus

Oh okay ur right

22. mckenzieandjesus

@calculusxy when i calculated that i came up with 132?