Answer:
let x=1
p (x)= 1cube -1 square-13 (1)+b
1-1-13+b
-15+b=0
b=15
let x=-3
p (x)=-3cube-(-3)square- 13 (-3)+b
-27-9+39+b
-36+39+b
3+b=0
b=3
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Answer:
let x=1
p (x)= 1cube -1 square-13 (1)+b
1-1-13+b
-15+b=0
b=15
let x=-3
p (x)=-3cube-(-3)square- 13 (-3)+b
-27-9+39+b
-36+39+b
3+b=0
b=3