book Maths Puzzle Numerical Ability

use synthetic division to divide the following polynomials:
1) divide 3x^5+13x^4+12x-1 by x+5
2) divide 3x^3-8x^2-20x by x+5

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book Other Question

If anglesA,B, and C are the sides of a triangle such that sin(A+B)=1/cos(C) and cos(A+B)=cos(C), then show that the triangle is a right triangle the square of a number decreased by the square of one half the number is 108. find the number.