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The formula for (x + y + z)^2 is
x^2 + y^2 + z^2 + 2xy + 2yz + 2xz
2 3 2
I think there is no formula but there is also a shortcut : (x+y+z)² can also be expressed as x²+y²
(2+3+4)² is equal to 2²+3²+4² so, 4+9+16 and the answer is 28.
1 5 1
Your answer is wrong... First, the formula exists. Second, when you add the numbers inside the parenthesis it gives you 9 and 9^2 is 81 not 28.
I want to try my formula. :)
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