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concon
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Homework Statement
Determine for what value/s of the parameter a the following planes in R3 are perpendicular:
ax + 0y - 5z = 3
ax + ay + 5z = -26
Write answer in form {a,b} or {a}
Homework Equations
I know that in R2 two vectors are perpendicular if
u*v = 0
What what do I use for R3 with planes?
The Attempt at a Solution
To solve this problem I need to know what it means for two planes to be perpendicular. I know in R2 that means there dot product is zero, what does that mean in R3? Also dot product?