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Need to find a and b such that x^4 - 8x^3 + 4x^2 + ax + b is a perfect square.? Which is the biggest country in this world? Pk alla mattina mi sveglio col pene duro? What numbers can be multiplied to equal -20 and added to equal 8? Calculate the heat required to convert 54.5 g of C2Cl3F3 from a liquid at 11.55 ∘C to a gas at 87.30 ∘C.?