book Maths Puzzle Numerical Ability

what is the product of this (x+3)(3x-5)?

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book Other Question

For each expression, either perform the indicated operation or solve the equation, whichever is appropriate.

1. -2/x=3/x+2
How do I use the synthetic division to solve a problem like
x^2+2x+4=(x+1)*(______)+(______)