exam Maths Puzzle Numerical Ability

How do you find all real numbers in this solution?x^3+6x^2+12x +8=0

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exam Other Question

Dante has Php19.50 in coins. if there were twice as many 5-centavos coins as 25-centavo coins, and as many 10-centavo coins as 5-centavo coins and 25 centavo coins combined, how many coins of each type were there? Divide. -3/0