- Factor and sketch. f(x)=x^4+6x^3+9x^2?

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Please help me with this math problem :) If f(g(x)) = g(f(x)) = x, and g(x) = 2 + ln(x+1), find f(4).? SO2 -> ? K2Cr2O7? The function f is f(x)= (x+4)(x-a), the graph of f is a parabola , a is const. The x coord. is b/w 1 and 3, which is a?
A. -2
B. 1
C. 5
D. 9? If the radius of the circle is increased by 6percent the area of the circle is increased by what percentage? How can we differentiate between alcohol and ether by chemical tests?