Question

Find a ⋅ b.

Answer 1

You could rewrite this as double brackets, as you are multiplying together two sets of two terms.

It would then look like:

(8i + 6j)(4i + 5j)

and you can expand by multiplying together all of the terms

8i × 4i = 32i²8i × 5j = 40ij6j × 4i = 24ij6j × 5j = 30j²

To get your final answer, you then just need to add together all of the like terms, and get 32i² + 30j² + 64ij

Please give me the brainliest answer :)