X^2-81=x^2-9^2=(x+9)(x-9)
this is the answer
We need to FOIL that out and then get it into standard form to see what our A, B, and C are. FOILing gives us
. If we move the 7 over by subtraction and set it equal to 0, we have
. In order to avoid a negative leading coefficient, we can change all the signs to get
so A = 1, B = 0, C = -18, first choice above.
Answer:
Step-by-step explanation:
<u>Given</u>
- Dimension of the prism: 3x4x6
- Side of each small cube: 1/2 mm
<u>Volume of the prism in terms of the number of small cubes:</u>
<u>Volume of each unit cube:</u>
<u>Volume of the prism:</u>
Correct choice is D
Wesley used 3/4 pounds of nails
1/2=2/4
4/4-1/4=3/4