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