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x 2 + 8x = (x + 4) 2 - 16, so x 2 + 8x - 5 = (x + 4) 2 - 16 - 5 = (x + 4) 2 - 21, so then (x + 4) 2 - 21 = 0 (x + 4) 2 = 21 -----> x + 4 = √21 -------> x = -4 + √21 x = -4 - √21

The idea of an unseen poem in an exam setting can be extremely unnerving- but if you set yourself up to feel comfortable reading and analysing poems you haven't studied before, you will have the tools to pic...

First we set y=artanh(x). Then we rearrange such that tanh(y)=x. There several approaches to find dy/dx, but the quickest is to use implicit differentiation. The differential of tanh(y) is sech 2 y. We diffe...

Write out what you know: HCL - VOL: 35 --- CONC: (x) --- MOL: (x) NaOH - VOL: 27.5 --- CONC: 0.3 --- MOL: (x) Realise what you can work out - Mol of NaOH in this case Mol = Conc x (Vol/1000) so Mol = 0.3 x (...

FSH it causes an egg to mature in an ovaryit stimulates the ovaries to release the hormone oestrogen. Oestrogen it stops FSH being produced - so that only one egg matures in a cycleit stimulates the pituitar...