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4(x² +4x +4) - (4x² -4x +1) = -8/ +8
4x² +16x +16 -4x² +4x -1 +8=0
20x +23 =0 / -20
20x = -23/:20
x= -23/20
b) - 3/√6 = - 3/√6· √6/√6 = -3√6/6= - √6/2