What is (a+b) ²= a²+2ab+…?

 The expression (a+b)² represents the square of the sum of a and b. To expand this expression, we can use the formula for squaring a binomial:

(a + b)² = a² + 2ab + b²

The formula tells us that the square of the sum of a and b is equal to the sum of the squares of a and b plus twice the product of a and b. So, the complete expansion of (a+b)² is:

(a+b)² = a² + 2ab + b²

We can also think of this as taking the first term (a) and multiplying it by the sum of the two terms (a + b), which gives us a(a + b) = a² + ab. Then we take the second term (b) and multiply it by the sum of the two terms (a + b), which gives us b(a + b) = ab + b². Adding these two expressions together, we get:

(a + b)(a + b) = a² + 2ab + b²

which is the same as (a+b)².

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