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Solve the inequality. x^2 + 2x -15 > 0

To solve the inequality, it must first be factorised. This could be done by the ‘complete the square’ method. However in this example it is more efficient to find a pair of numbers that multiply to give the ...
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Answered by Elizabeth F. • Maths tutor
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What is a food chain we might see in the UK?

A food chain demonstrates what different species of animals present in an ecosystem eat, and are eaten by. The start of the food chain is a producer - an organism which makes food. This is generally a plant,...
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Answered by Caroline T. • Biology tutor
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how do you convert binary to a form in which you can perform subtraction?

You can use a common method involving 1's compliment, in which the binary number is inverted and then added, which overall gives subtraction. E.g. 8+3 =>> 8 10 = 1000 2 and 3 10 = 0011 2 . 1's complime...
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Answered by Thomas G. • Computing tutor
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From June 2015 Edexcel paper: Solve 7x + 8 = 2x – 3

Whenever you have a question asking you to solve an algebraic equation with only one unknown (x) you must put all 'x' terms on one side of the equation and all non-'x' terms on the other: 1. Take 2x away fro...
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Answered by John J. • Maths tutor
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The line L1 has an equation y=2x-2. What is the equation of the line L2 which is parallel to L1 and passes through the point (0,3)?

The first thing to immediately recall is that parallel lines have the same gradient. in the equation of a line (which is expressed in the y=mx+c format), the gradient (m) is the coefficient of x. Note: if th...
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Answered by Hafsah B. • Maths tutor
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