Find the value of the expression a2+b2+c2+d2a^2 + b^2 + c^2 + d^2a2+b2+c2+d2 given that a+b+c+d=0a + b + c + d = 0a+b+c+d=0 and ab+ac+ad+bc+bd+cd=−6ab + ac + ad + bc + bd + cd = -6ab+ac+ad+bc+bd+cd=−6.
666
121212
000
363636