Posted by **Mimi** on Tuesday, May 3, 2011 at 5:34pm.

Mutliply.

(9t² - t- 7)(4t²+9t-1)

AND

Find the product.

(5a+2)³

- Math -
**MathMate**, Tuesday, May 3, 2011 at 9:36pm
Multiply:

(9t² - t- 7)(4t²+9t-1)

You can do a long multiplication, with the appropriate terms in the same columns, just like the multiplication of multi-digit numbers.

Alternatively, you can multiply visually, looking for highest to lowest terms:

t^4: 9*4 =36

t^3: 9*9+4(-1)=77

t^2: 9(-1)+(-1)(9)+(-7)(4)=-46

t: (-7)(9)+(-1)(-1)=-62

1: (-7)(-1) = 7

So the product is:

36t^4+77t^3-46t^2-62t+7

Quick check:

put t=1, so calculate the sum of coefficients of each factor:

(9t² - t- 7)(4t²+9t-1)

=(9-1-7)(4+9-1)

=1*12

=12

Sum of coefficients of product

=36+77-46-62+7

=12

checks.

## Answer This Question

## Related Questions

- math - evaluate (a+b)^2 and mutliply (g_6h(g-6h) thanks.
- math - need help again mutliply x(x+1)(x-1) and factor completely 6y^2-2yz and ...
- algebra - please explain how you mutliply 1955.6 by 5/9
- percents - If I need to mutliply 80.00 times 8.25%, where do i put my decimals ...
- Math - How do I mutliply the following; (4x2+3x-3)(4x2+3x-3)
- math - Find the two numbers that multiply to the product number and add to the ...
- alegbra - (2a+4b)-(3a-b)when and how do u know to change the signs? It might ...
- Math - Using the expression 56xy + 5 -6x + y/20,find the following: a. Find two ...
- math - how do you do anarrays and an expanded algorithm problem find each ...
- Math Ms. Sue please - 1. What is the product of (-6.8)^2? -13.6 46.24 -46.24 13....

More Related Questions