Question

(a+b+c+d)²= what .pls

Answer 1

Step-by-step explanation:

The general formula is

(a+b+c+d+e+....)^2 = Sigma(a^2) + 2Sigma(ab) where Sigma is the symbol for SUM OF SIMILAR TERMS.

Here Sigma(a^2) = a^ + b^2 + c^2 + ....... (Sum of squares of all terms)

2Sigma(ab) = 2ab + 2ac + .....+ 2bc + 2bd + ...+ 2cd + ... +.. (Sum of twice the product of terms taken two at a time.)

With this, the square can be found for any number of terms.

Hence, (a+b+c+d)^2 = a*2 + b^2 + c^2 + d^2 + 2( ab + ac + ad + bc + bd + cd) >>>>>Answer.

So, just remember that initial formula Sigma(a^2) + 2Sigma(ab)