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Mathematics · 2020
JEE Main · 7 January 2020, Shift 1 · Q63
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:
If $\displaystyle y=\mathrm{m} x+4$ is a tangent to both the parabolas, $\displaystyle y^2=4 x$ and $\displaystyle x^2=2 \mathrm{~b} y$, then b is equal to :
Official answer
(3)
$\displaystyle -128$
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JEE Main 2020 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.