book Maths Puzzle Numerical Ability

x^4-5x^3+12x^2-5x-2
factorise it

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book Other Question

Please help me with these problem..
solve by any method.
1)x^2+25=10x
2)10h-2=11h^2
HI, I do not know if this statement is true or false(why?)

The row space and the nullspace of an invertible matrix are the same

Ax=b has no solution, then b is not in the col