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Factorise X^2 + 1X -12

Because the highest power of X is 2, this is a Quadratic Equation When factorised, these look like (x + a)(x + b) where a & b are constants To factorise this, we need to find 2 numbers which add together...
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Answered by Jack W. • Maths tutor
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Describe the process of evolution (6 Marks)

Mutations in genetic code occur naturally leading to different alleles in genes. (1 mark) This leads to variation within a species. (1 mark) Variation provides some individuals with traits which mean they ar...
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Answered by Jack W. • Biology tutor
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Show clearly that (3√3)^2 = 27

Show clearly that (3√3) 2 = 27 First of all, the question looks overfacing due to the surds, I can assure you that surds are not scary, they simply act as a means of clearing up messy numbers such as 1.73205...
EC
Answered by Eleanor C. • Maths tutor
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How to solve the absolute-value inequalities?

Absolute value means how far away you are from zero. It's better to draw a number line to understand and solve the question. Given the inequality l 4x+3 l >15 , the distance of the 4x+3 value from 0 must ...
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Answered by Cynthia C. • Maths tutor
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Describe the ways in which LDLs and HDLs affect the formation of atheromas.

Remember that often in A-level exams you can get marks from specific key words and phrases, so first of all try to remember everything you know about the topics in the question ( HDLs , LDLs and atheromas )....
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Answered by Iona D. • Biology tutor
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