exam Maths Puzzle Numerical Ability

what is the answer to -2x2 + 5x = 0

15c2 - 12c = 48


m2=4m - 4

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exam Other Question

i need explanation on the following if someone can help me understand the steps to these problems they are all but one in the back of the book but i want to understand them i have if (1+x+x^2)= a0+a1x+a2x^2+a3x^3+........+a2nx^2n then show that

a0+a3+a6+......= 3^(n-1)