book Maths Puzzle Numerical Ability

(x)=8

I need to understand how to get the answer for this question
for a final.

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book Other Question

Given the quadratic equation: x^2 - 5x + 1 = 0.

A. What is the sum of the roots?

B. What is the product of the roots? The sum of a geometric series is 57232. The common ratio is 2 and the last term is 28672. What is the first term?