What do you mean formula?

is that perfect square trinomial?

4ac

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What do you mean formula?

is that perfect square trinomial?

4ac

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The formula for (x + y + z)^2 is

x^2 + y^2 + z^2 + 2xy + 2yz + 2xz

x^2 + y^2 + z^2 + 2xy + 2yz + 2xz

+z².

Example:

(2+3+4)² is equal to 2²+3²+4² so, 4+9+16 and the answer is 28.