exam Maths Puzzle Numerical Ability

State the zero for the function. f(x)= 4x+12

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I am suppose to simplify can you help?
Do I factor? There is no book
x^2 = 2x - 15
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x^ - 9
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x^2 + 6x +5
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x^2 + 4x + 3
thanks, base of a rectangle=10 m and the height is 7m.What is the perimeter dilated to half the size?
I appreciate your help.