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How do you expand (2x+9)^2?

(2x+9) 2 = (2x+9)(2x+9) Use FOIL to expand these brackets: First - ( 2x +9)( 2x +9) --> 4x 2 Outside - ( 2x +9)(2x+ 9 ) --> 4x 2 + 18x Inside - (2x +9 )( 2x +9) --> 4x 2 + 18x + 18x Last - (2x +9 )(...
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Answered by Alec M. • Maths tutor
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What is the difference between exothermic and endothermic reactions?

The first law of thermodynamics states that energy can neither be created nor destroyed. Energy has to be used when breaking bonds, yet is formed when making bonds. This means that there will be an overall n...
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Answered by Alec M. • Chemistry tutor
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How may cells be specialised to their function?

Despite animal cells all having a nucleus (for genetic information storage and reproduction), a cytoplasm (for structure), mitochondria (for aerobic respiration), ribosomes (for protein synthesis) and a cell...
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Answered by Alec M. • Biology tutor
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5x - 2 > 3x + 11

Firstly we need to get all the x's on one side and the numbers on the other side. So if we add 2 to both sides we get 5x > 3x + 13. Now as we want the x's on the right hand side, we need to subtract both ...
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Answered by Sam C. • Maths tutor
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Describe how a new phenotype may arise in the population and increase in frequency using the theory of natural selection.

A mutation arises in an individual that confers a selective advantage. The phenotype the mutation produces is selected for by natural selection and so the individual survives to reproductive age. This mutati...
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Answered by Katy A. • Biology tutor
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