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Expand and simplify (6x - 2y)(3x - 7y)

Expand brackets: 18x^2 - 42xy - 6xy + 14y^2 Simplify: 18x^2 - 48xy + 14y^2 3 marks
BW
Answered by Beth W. • Maths tutor
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Factorise and solve x^2 - 8x + 15 = 0.

The easiest method to solve quadratic equations by hand is by factorisation - which means putting the equation into brackets, effectively expressing the equation as a product of two linear expressions. Imagi...
RB
Answered by Rachel B. • Maths tutor
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Discuss the use of imagery in the poem "Medusa" by Carol Ann Duffy

Ultimately, the entire poem is an extended metaphor for a woman consumed by jealousy as she parts from her lover. Her jealousy is portrayed through the violent animalistic images of creatures the speaker is ...
HM
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How do you increase the rate of a reaction?

There are multiple ways of increasing the rate of a reaction, but overall, increasing the number of particles successful collisions will increase the rate of reaction. This can be done by increasing the temp...
ZJ
Answered by Zoe J. • Chemistry tutor
4083 Views

how do emulsifier molecules able to produce an emulsion that is a stable mixture containing vegetable oil and water?

the emulsifier molecule has a hydrophilic "head" and a hydrophobic "tail". the head can dissolve in water and the tail can bind with the oil molecules which forms a stable suspension of o...
MC
Answered by Monty C. • Chemistry tutor
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