Prove that the linw lx+my+n=0 will touch parabola y^2=4ax,If nl=am^2

Prove that the linw lx+my+n=0 will touch parabola y^2=4ax,If nl=am^2
(Parabola solved question)
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Prove that the line 𝐥𝐱 + 𝐦𝐲 + 𝐧 = 𝟎 will touch the parabola 𝐲
𝟐 = 𝟒𝐚𝐱 if 𝐥𝐧 = 𝐚𝐦𝟐
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7.