exam Maths Puzzle Numerical Ability

I need so help with this problem.
given that (3x-a)(x-2)(x-7)=3x^3-32x^2+81x-70 what is the value of a?

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exam Other Question

Find the indicated root
121m8n4 Use completing the square or the quadradic formula to find the solutions to the equation: x^2-4x+2=0. Thank you for your time.