Show all steps to factor completely x^4− 5x+ 4

I tried to do this but the gcf was 1 so im confuse??
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Abouncy ball is released from a certain height. on the first bounce, it travels 32cm. with each subsequent bounce, it travels 9/10 the distance of the previous bounce. what is the total distance that the ball has traveled when it completes its 25th bounce?

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.