| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.75 |
| Score | 0% | 75% |
Simplify (7a)(7ab) - (9a2)(4b).
| 182ab2 | |
| -13ab2 | |
| 182a2b | |
| 13a2b |
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.
(7a)(7ab) - (9a2)(4b)
(7 x 7)(a x a x b) - (9 x 4)(a2 x b)
(49)(a1+1 x b) - (36)(a2b)
49a2b - 36a2b
13a2b
To multiply binomials, use the FOIL method. Which of the following is not a part of the FOIL method?
Odd |
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First |
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Inside |
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Last |
To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses.
Which of the following is not a part of PEMDAS, the acronym for math order of operations?
exponents |
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pairs |
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addition |
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division |
When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
What is the circumference of a circle with a diameter of 19?
| 19π | |
| 34π | |
| 17π | |
| 13π |
The formula for circumference is circle diameter x π:
c = πd
c = 19π
Which of the following statements about math operations is incorrect?
you can subtract monomials that have the same variable and the same exponent |
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you can add monomials that have the same variable and the same exponent |
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all of these statements are correct |
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you can multiply monomials that have different variables and different exponents |
You can only add or subtract monomials that have the same variable and the same exponent. For example, 2a + 4a = 6a and 4a2 - a2 = 3a2 but 2a + 4b and 7a - 3b cannot be combined. However, you can multiply and divide monomials with unlike terms. For example, 2a x 6b = 12ab.