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From factorising a^2-b^2 hence or otherwise simplify fully (x^2 + 4)^2 - (x^2-2)^2

This question is a GCSE Higher tier style question. First the student should recognise that a²-b²= (a-b)(a+b). Using this to solve (x²+4)²-(x²-2)

Answered by Mythili S. • Maths tutor

10316 Views

What is the function of a chloroplast?

They are where photosynthesis takes place, providing food for the plant. Chloroplasts contain chlorophyll pigment, which makes it green, which harvests the light needed for photosynthesis.

Answered by Louisa B. • Biology tutor

6086 Views

Explain what metallic bonding is.

There is a structure of positively charged metal ions arranged in a regular pattern. Between these metal ions lie a sea of delocalised electrons which have been delocalised from the metal atoms to form th...

Answered by Louisa B. • Chemistry tutor

1522 Views

Find the coordinates of the minimum point of the function y=(x-5)(2x-2)

At the minimum point the gradient is zero so dy/dx=0. To find dy/dx, first expand out the brackets so y=2x^2 - 12x + 10. Using differentiation dy/dx=4x - 12. At the minimum 4x-12=0 so 4x=12 therefore x=3....

Answered by Phoebe C. • Further Mathematics tutor

1815 Views

Describe the process of natural selection

There is variation naturally present between members of a species. These variations can prove advantagous, thus making an individual in a species better adapted for survival. For example, giraffes with a ...

Answered by Julia C. • Biology tutor

2430 Views