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a oxygen in water ‹slightly› negatively charged and hydrogens ‹slightly› positive b hydrogen bonding due to the dipola...

When approaching primary source questions it is worth remembering that the examiner needs to see you weigh up the source’s evidence in the light of your own knowledge. This is easy to do if you apply the ...

x²+6x+5=0 First of all half the x coefficient and write (x+6/2)² the take away the (6/2)² and add on the 5
(x+3)²-9+5=0
(x+3)²-4=0 ...