Lesson 74 – Doodles Do Algebra


Update: This Lesson Is Part of Book 3 of Doodles Do Algebra: “The Basic Math of Algebra” available on Amazon.



Available in the book, “The Basic Math of Algebra, Book 3 of Doodles Do Algebra“


OK, so today is the last day of simple algebraic division. Next week your child learns how to divide one polynomial by another. The problems today potentially have two steps: first is the simple division and second is the possible expansion (multiplying out) of terms and then simplification by adding and or subtracting terms that you can combine.


1. 2(a+c)+3(a+x)=2a+2c+3a+3x=5a+2c+3x

2. (x+y)-2a(x-y)=x+y-2ax+2ay

3. a(c+d)+b(c^2-d)=ac+ad+bc^2-bd

4. ac-bc

5. 6(a-b)+3c(a-b)^2=6a-6b+3c(a^2-ab-ba+b^2)=6a-6b+3a^2c-6abc+6b^2c

6. a(x+y)+c(x+y)^2=ax+ay+c(x^2+xy+yx+y^2)=ax+ay+cx^2+2cxy+cy^2