Find a ⋅ b. a = 7i – 4j, b = 4i + 3j

Find a ⋅ b a = 7i – 4j, b = 4i + 3j


28i^2 + 5ij – 12j^2

Step-by-step explanation:


7i times 4i is 28i^2

7i times 3j is 21ij

-4j times 4i is -16ij

-4j times 3j is -12j^2

In equation it looks like this:


Simplify 21ij and -16ij

21ij-16ij is 5ij

So the answer is:

28i^2 + 5ij – 12j^2

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