exam Maths Puzzle Numerical Ability

b^2 - ab - 6a^2 I was told to facrtor this problem completely and this is the answer that I came up with am I right?(b + 3a)(b - 2a)

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exam Other Question

Please could you tell me if an 88% DNA match has a good chance of being right or does percentages work differently with DNA INDICATE WHETHER THE EQUATION HAS NO SOLUTION OR IS TRUE FOR ALL REAL NUMBERS. IF NIETHER IS THE CASE, SOLVE FOR THE VARIABLE.

10x-2(4+5x)=8