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How to complete the square to solve quadratic equations?

Equation: x 2 +4x-5=0 (This is in the form ax 2 +2bx+c=0)First divide 2b by 2 (4/2=2)Then put this into (x+b) 2 -(b) 2 +c=0This gives: (x+2) 2 -(2) 2 + -5=0 (remembering +and- makes a -)Simplify to: (x+2) 2 ...
GJ
Answered by George J. • Maths tutor
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How accurate is it to say that it was the interest taken by James VI that accounts for the extent of witchcraft persecutions in Scotland in the years 1590-97?

James VI had a strong interest in witchcraft during the early part of his reign; as evidenced by his involvement in witch trials during the 1590s and the book he published on witchcraft, “ Deamonology ”, in ...
HK
Answered by Hannah K. • History tutor
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Practice question - How significant were the differences between the Northern and Southern states c1845? [25 marks]

Think about how to approach the question and from there think about how to structure it. Split points into differences which were significant and those that were not along with any similarities. Try to group...
BC
Answered by Ben C. • History tutor
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For a large-scale water management project, describe one cost and one benefit.

The Three Gorges Dam was built in China as a large-scale water management project. A benefit of the Three Gorges Dam is that it provides hydroelectricity to the surrounding area. A cost of the Three Gorges D...
AB
Answered by A B. • Geography tutor
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What does the strength of lattice enthalpy of formation depend on?

So, lattice enthalpy of formation is defined as the 'standard enthalpy change when one mole of an ionic crystal lattice is formed from its constituent ions in gaseous form '. The strength of this lattice dep...
ZA
Answered by Zaynab A. • Chemistry tutor
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