There are common questions that students have in pre algebra. We are answering a couple questions here:
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Steph asks, "In using the distributive property to simplify algebraic expressions do I distribute or add first. For example, do I subtract 8 - 9 first in 8 - 9 (7 - 5 x )?"
Steph, always remember PEMDAS (Please Excuse My Dear Aunt Sally) for the "order of operations" with algebraic operations. We do multiplication and division before addition and subtraction. Therefore, use the distributive property with multiplication BEFORE subtracting 8 - 9. To make things easier for you, consider multiplying by - 9. Your simplification will look like this:
8 - 9 (7 - 5 x )
= 8 - 9 (7) + (- 9 ) ( - 5)
= 8 - 63 + 45
Now add (subtract) left to right and you have:
= - 55 + 45
= - 10
Abby asks, "Are there good pre algebra videos?"
Algebra: Videos from beginning Algebra through Algebra II (Data Math).
Algebra I Worked Examples: Sample problems worked from Algebra I.
Developmental Math 2: Oodles of worked examples from Algebra through Algebra II
ck12.org Algebra I Examples: Great review topics to make sure you understand Algebra I topics.
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