1) x²-16x+70=x²-2•8•x+64+6=(x+8)²+6
2) x²+4x-4=x²+2•2•x+1+.....=?
3)9a²-6a+6=?
4b²-12b=?
5)9c²-30c+35=?
6)16m²+56m-19=?​
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