exam Maths Puzzle Numerical Ability

keep getting stuck on this one
Use synthetic division to divide (x^3+8x^2+21x+20) / (x+4).
thanks for your help

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exam Other Question

Store ABC began business 5 years ago.
Express your table data showing the relationship between the year in business and profit as ordered pairs and state the domain range of the r Question #1: Simplify: (2 root3 -4)squared

#2: Solve and check: root y+2 =4-y