Express each of the following expressions in the form(x+a)²+b.
(a) x²+12x
(b) x²-6x+1
(c) x²+3x-2
(d) x²+9x-1
(e) x²+1/2x
(f) x²-2/9x
(g)x²+ 0.2x
(h) x²-1.4x
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