book Maths Puzzle Numerical Ability

Please help me. I tried to figure this out but I am wrong. 2X^4+11X^3+19X^2+X-29=(X^2+4X+6)*(_)+(_) Thank you.

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book Other Question

0.9872^X=0.5

how do i figure out what X is without just putting in numbers and seeing if they equal 0.5? I need to find a formula for the nth term from the following arithmetic sequence. Then find the fiftieth term: 3,7,11,15,... Thank you for attempting to help me solve this problem.

This problem is from a made up worksheet.