exam Maths Puzzle Numerical Ability

given that (3x-a)(x-2)(x-7)=3x^3-32x^2+81x-70, determine value of a

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how to solve radicals equations involving roots Two golf balls are hit and their paths are described by these equations:
Golf Ball#1: h(t)=-1/5(t-3)^2+15 ; Golf Ball #2: h(t)=-1/4(t-2.5)^2+12, where h is height in metres above