book Maths Puzzle Numerical Ability

Factoring is what i'm doing here.... 1. 15x^2+31=10
i tried another source and it came up with 15x^2+41x amd thats not the answer i'm looking for. i need it to look like this ki

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book Other Question
two trains left a station @ the same time. One traveled north at one speed and the other traveled south @ twice the speed. After 4 hours, the trains were 600 miles apart. How fast Find the product of the matrices

6 -2 * -4 -2 5
1 4 4 -6 -1 please explaine it briefly
0 5

next question solve the matrix equation
-1 2 2 1 = 3 -2
-4 6 x- 3 0 1