April 17

Week 9– Math 10

This week we leant some interesting patterns. Just like the pictures show below.

IMG_0447 IMG_0448

This week we also learnt three formulas, they can help us to figure out questions quicker than before.

  • (a+b)^2=a^2 +2ab+b^2
  • (a-b)^2=a^2-2ab+b^2
  • (a+b)(a-b)=a^2-b^2

We just need to remember those formulas.

For example: (4-7x)(4+7x)

If you use the distributive property(FOIL), you need to write down: =4×4+4×7x-4×7x-7×7x=16-49x

If you use the formula, you just need one step.

 

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Posted April 17, 2016 by katew2014 in category Math 10

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