exam Maths Puzzle Numerical Ability

Find the gcf for the group of terms:
-30a^3, 5a^4

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5(2K-5)-2(K-8) > 3(2k +4) + K-2 I know there is a help which can be used for solving quadratic equations, but I'm not sure how it works. Can you give that information and explain the process. It's something lik