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(a) Expand and simplify (x − 3)(x + 5), ..2 marks.. (b) Solve x^2 + 8x − 9 = 0 ..3 marks..

(a) Remember: Multiply each term in the left bracket by every term in the right bracket.(x-3)(x+5) = x²+ 5x - 3x -15.Collecting all of the like terms:= x²+ 2x -15.
(b) Solve x

Answered by Jack W. • Maths tutor

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What is the difference between simple diffusion and active transport?

Simple diffusion is the movement of a molecules from an area of high concentration to an area of low concentration across a semipermeable membrane. Diffusion happens in liquids and gases as their particle...

Answered by Simi K. • Biology tutor

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What techniques would you use to separate: 1) different colour inks from black ink. 2) ethanol from ethanol and water 3) salt from water

You would use chromatography, the different colours have different affinities depending on the solvent you use. So different colours will travel longer than other on your chromatogram (support).2) Y...

Answered by • Chemistry tutor

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Are you able to list for me: two examples of a hardwood, and two examples of a softwood?

Hardwoods: oak, mahogany, maple, ash, birch, etc. Softwoods: pine, spruce, cedar, fir, etc. Disallow any manufactured boards, e.g. plywood, MDF, etc.

Answered by Bryce F. • Design & Technology tutor

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What is the difference between the indicative, and the subjunctive?

First of all, it is important to understand that the indicative and subjunctive are both moods. This is something that reflects a speakers attitude towards a statement. The indicative mood is used towards...

Answered by Patrick S. • Spanish tutor

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