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First of all expand the brackets and simplify the expression given:(4n+1)(4n+1)-(2n-1)= 8n²+8n+1-2n+1= 8n²+6n+2= 2(4n²+3n+1). Since the expression can be factorised with 2...

The leader of the Gauls was afraid that the Romans might hear the men climbing the hill.And so he ordered all the Gauls to say nothing on the journey.That night the Gauls advanced so silently that the Rom...

While I doubt students will ask this exact question, think it provides the basis for what are usually the most difficult questions in GCSE papers, and students would usually be unsure where to start. My i...

This question can be split into two parts, the first is calculating overall resistance: in series the R_total = R₁ + R₂ so here R_total = 10Ω + 20Ω = 30Ω The seco...

I find it easiest to remember the different elements of a treaty by creating an acronomyn. For example, the Treaty of Versailles angered many germans due to four clauses. Loss of territories, limitations ...