h1 = w1·x + b1 = 2·1 + 0   = 2.0
a1 = ReLU(h1)  = max(0, 2)  = 2.0
h2 = w2·a1 + b2 = 3·2 + 1   = 7.0
L  = (h2 − y)²  = (7 − 2)²   = 25.0