Question

What is the formula of (a+b+c)^2
​

Answer 1

The square of the sum of three or more terms can be determined by the formula of the determination of the square of sum of two terms.

Now we will learn to expand the square of a trinomial (a + b + c).

Let (b + c) = x

Then (a + b + c)2 = (a + x)2 = a2 + 2ax + x2

= a2 + 2a (b + c) + (b + c)2

= a2 + 2ab + 2ac + (b2 + c2 + 2bc)

= a2 + b2 + c2 + 2ab + 2bc + 2ca

Therefore, (a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca

Hope it helps

Plz mark as the brainliest

Answer 2

Answer:

ab = ¼ [(a + b)² - (a - b)²] (a - b)² = (a + b)² - 4 ab. (a + b)² = (a - b)² + 4 ab. (a+b+c)² =a²+b²+c²+2ab+2bc+2ca. (a-b+c)² =a²+b²+c²-2ab-2bc+2ca.

Step-by-step explanation:

hope it helps you mark me as the brailiest