Question

show 2and 5/2 are the zeros of the polynomial 2xcube-3xsquare-17x+30 also.find the third zero of the polynomial

Answer 1

by substituting in
$2 {x}^{3 } - 3 {x}^{2} - 17x + 30$
i)
2(8)-3(4)-17(2)+30
16-12-34+30
4-34+30
4-4=0
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2(125/8)-3(25/4)-17(5/2)+30
125/4-75/4-85/2+30
50/4-85/2+30
50/4-55/2
(50-110)/4
-60/4=-15