| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.54 |
| Score | 0% | 71% |
Simplify (9a)(7ab) + (3a2)(2b).
| -57ab2 | |
| 69ab2 | |
| 69a2b | |
| 80ab2 |
To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.
(9a)(7ab) + (3a2)(2b)
(9 x 7)(a x a x b) + (3 x 2)(a2 x b)
(63)(a1+1 x b) + (6)(a2b)
63a2b + 6a2b
69a2b
Simplify (2a)(5ab) - (9a2)(2b).
| -8a2b | |
| 77a2b | |
| 28ab2 | |
| 77ab2 |
To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.
(2a)(5ab) - (9a2)(2b)
(2 x 5)(a x a x b) - (9 x 2)(a2 x b)
(10)(a1+1 x b) - (18)(a2b)
10a2b - 18a2b
-8a2b
What is the circumference of a circle with a diameter of 9?
| 8π | |
| 36π | |
| 9π | |
| 14π |
The formula for circumference is circle diameter x π:
c = πd
c = 9π
What is 3a4 + 4a4?
| 7a4 | |
| a48 | |
| -1 | |
| -a8 |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
3a4 + 4a4 = 7a4
What is 4a + 8a?
| a2 | |
| 32a | |
| -4a2 | |
| 12a |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
4a + 8a = 12a