A
It is 2zh - h^2.
=b+2h+r+x+z+q+a+p+l+f+g+d
H d a z?
Expand z plus 11 times z plus 11 = (z+11)(z+11) = z2 + 22z + 121.
True
It is 5x+y
(z + 15)(z + 3)
10
2z + 5 - xz
x + y + z = x + z + y is the commutative property of addition.
H, I, N, O, S, X, Z H, I, N, O, S, X, Z H, I, N, O, S, X, Z H, I, N, O, S, X, Z
Z + or - i and z-1