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Factorise fully X^2 - 6X + 8

Factorising means reducing an equation to a set of brackets, in the form (x+a)(x+b), where a and b are constants. To factorise this equation, we must find two numbers that add to make -6, and multiply to ...

Answered by Dan D. • Maths tutor

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Technetium is an element commonly used in medicine. A technetium atom is represented as ^99 _43 Tc. Give the number of protons, neutrons and electrons in this atom of technetium.

⁹⁹₄₃Tc (how it should be represented in question)
Number of protons = 43 Number of neutrons = 56 Number of electrons = 43
Technetium is given here in nuclear notation. This...

Answered by Daniel J. • Chemistry tutor

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Explain the stages of Piaget's theory of cognitive development (4 marks).

Piaget's theory of cognitive development has four main stages of mental development in children. It focuses on how children acquire knowledge throughout their childhood, in a stage-like fashion, as oppose...

Answered by Shona W. • Psychology tutor

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