# What is 2 + 2

## 2 + 2 = 4

For anyone who can multiply out parentheses, the first binomial formula is actually nothing new, even if it seems daunting at first glance. Because this is:

1. Binomial formula: ( a + b )2 = a2 + 2ab + b2

Derivation: ( a + b )2 = ( a + b ) · ( a + b ) = a2 + ab + ba + b2 = a2 + 2ab + b2

Map:

The derivation is interesting for all those who ask themselves: “Where does this actually come from?” All the others need only the mathematical expression, which I marked in bold. The derivation simply shows how to multiply the brackets ( which we have already explained in the linked section above). A few examples demonstrate how to apply the formula:

( 3 + 4 )2 = 32 + 2 · 3 · 4 + 42 = 9 + 24 + 16 = 49

( 1 + 2 )2 =12 + 2 · 1 · 2 + 22 =1 + 4 + 4 = 9

Tip: Look into the binomial formula and make it clear what a and b are. And then you use the numbers for a and B. Compare the formula with what I have calculated above, then it should become clearer. Our exercises ( link at the bottom of the article ) should also provide additional enlightenment.

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