If $y = m x + 4$ is a tangent to both the parabolas, $y ^ { 2 } = 4 x$ and $x ^ { 2 } = 2 b y$, then $b$ is equal to (1) $-32$ (2) $-64$ (3) $-128$ (4) 128
If $y = m x + 4$ is a tangent to both the parabolas, $y ^ { 2 } = 4 x$ and $x ^ { 2 } = 2 b y$, then $b$ is equal to\\
(1) $-32$\\
(2) $-64$\\
(3) $-128$\\
(4) 128