exam Maths Puzzle Numerical Ability

Rewrite the equation to standard form?
-16x^2-128x+12y^2-48y-400

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exam Other Question

X2( THE 2 IS AN EXPONENT) +6X+8= _____. If Earthquake 1 measures 6.2 on the Richter scale, and Earthquake 2 measures 8.2 on the Richter scale, how many times bigger was Earthquake 2 than Earthquake 1? (Rephrased: By what factor was Earthquake 2 bigger than Earthquake 1?)