need help with question b (3d geom, planes and vectors)

U

umricky

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May 24, 2023
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as you can see i tried doing it but im not sure if i did it correctly. i feel like i messed up when i converted my vector equation of the plane to the cartesian form.

pls let me know if i did it correctly.

https://imgur.com/a/yHEXr4I
 
I agree that 3x+4z = 0 even though you computation of [imath]\overrightarrow n[/imath] seems to have one wrong sign. But I don't understand how you compute [imath]\cos\theta[/imath], and the compute value seems wrong to me.
 
blamocur said:
I agree that 3x+4z = 0 even though you computation of [imath]\overrightarrow n[/imath] seems to have one wrong sign. But I don't understand how you compute [imath]\cos\theta[/imath], and the compute value seems wrong to me.
Click to expand...
what did i do wrong when i tried to find n? bc rn i multiplied 2 direction vectors.

to find cos i used the equation to find the angle between two vectors using the dot product
 
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