book Maths Puzzle Numerical Ability

{{{1.4x^2+4.9x+2.6=0}}}

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book Other Question

Please help me solve this:

Find the exact quotient using synthetic division:

2x^4 - x^3 -18x^2-7/x - 3

Please show the step by step solution.

Thanks Can you explain to me the Absolute Value-Square Root Theorem?
Thank you.