# What is the unit vector that is normal to the plane containing # ( i +k) # and # ( i + 7 j + 4 k) #?

##### 1 Answer

Aug 3, 2016

#### Answer:

#### Explanation:

first, you need to find the vector (cross) product vector,

computationally, that vector is the determinant of this matrix, ie

for the **unit vector** we have