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To expand, you would multiply each term in the first bracket set by each term of the second bracket set. Thus, your expansion would mean:3a^2 -6ab + ab -2b^2
To simplify, note that there are two 'ab'...

There are three blood vessel types in humans: arteries, veins and capillaries.Arteries pump blood away from the heart (easy point to remember - "A" in arteries = AWAY from the heart) while veins...

Plant cells have cell walls and animal cells do not. Plant cells also have chloroplasts while animal cells do not.Optional third point: plant cells have vacuoles while animal cells do not.

Add a drop of each liquid to individual test tubes.To each test tube, add dilute nitric acid and silver nitrate solution.A precipitate will form for each ion present.chloride= whitebromide= creamiodide= y...