book Maths Puzzle Numerical Ability

How do we solve (2u+4)(u+1)

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book Other Question

5x^-15x^3-25x-10 need to find out how to set this problem? put the equation in the standard form of a quadratic equation ax2+bx+c=0
1. 4/x2+3/x-10=0

2. 6+4/x-1=5/x-3

3. 3.5x+4.6/x =1.2

i could not figure how to write a fraction