book Maths Puzzle Numerical Ability

simplify: (x^2-6x+8)/(x^2+3x-28) *(x^2+6x-7)/(x^2-3x+2)

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book Other Question

Express as a single logarithm: ln 8 - ln2

these kinda problems get on my nerves , help me please Find the real solution, if any. Use quadratic formula and calculator.
x^2+sqrt2x-2=0

Thanks Caroline