Carry out three steps of the Bisection Method for f(x)=3x−x4 as follows: (a) Show that f(x) has a zero in [1,2]. (b) Determine which subinterval, [1,1.5] or [1.5,2], contains a zero. (c) Determine which interval, [1,1.25], [1.25,1.5], [1.5,1.75], or [1.75,2], contains a zero.

Answer:a) There's a zero between [1,2]b) There's a zero between [1.5,2]c) There's a zero between  [1.5,1.75].Step-by-step explanation:We have [tex]f(x)=3^x-x^4[/tex]A)We need to show that f(x) has a zero in the interval [1, 2]. We have to see if the function f is continuous with f(1) and f(2).[tex]f(x)=3^x-x^4\\\\f(1)=3^1-(1)^4=3-1=2\\\\f(2)=3^2-(2)^4=9-16=(-7)[/tex]We can see that f(1) and f(2) have opposite signs. And f(1)>f(2) and the function is continuous, this means that exists a real number c between the interval [1,2] where f(c)=0.B)We have to repeat the same steps of A) For the subinterval [1,1.5]:[tex]f(x)=3^x-x^4\\\\f(1)=3^1-(1)^4=3-1=2\\\\f(1.5)=3^1^.^5-(1.5)^4=5.19-5.06=0.13[/tex]f(1) and f(1.5) have the same signs, this means there's no zero in the subinterval [1,1.5].For the subinterval [1.5,2]:[tex]f(x)=3^x-x^4\\\\f(1.5)=3^1^.^5-(1.5)^4=5.19-5.06=0.13\\\\f(2)=3^2-(2)^4=9-16=(-7)[/tex]f(1.5) and f(2) have opposite signs, this means there's a zero between the subinterval [1.5,2].C)We have to repeat the same steps of A) For the subinterval [1,1.25]:[tex]f(x)=3^x-x^4\\\\f(1)=3^1-(1)^4=3-1=2\\\\f(1.25)=3^1^.^2^5-(1.25)^4=3.94-2.44=1.5[/tex]f(1) and f(1.25) have the same signs, this means there's no zero in the subinterval [1,1.25].For the subinterval [1.25,1.5]:[tex]f(x)=3^x-x^4\\\\f(1.25)=3^1^.^2^5-(1.25)^4=3.94-2.44=1.5\\\\f(1.5)=3^1^.^5-(1.5)^4=5.19-5.06=0.13[/tex]f(1.25) and f(1.5) have the same signs, this means there's no zero in the subinterval [1.25,1.5].For the subinterval [1.5,1.75]:[tex]f(x)=3^x-x^4\\\\f(1.5)=3^1^.^5-(1.5)^4=5.19-5.06=0.13\\\\f(1.75)=3^1^.^7^5-(1.75)^4=6.83-9.37=(-2.54)[/tex]f(1.5) and f(1.75) have opposite signs, this means there's a zero between the subinterval [1.5,1.75].For the subinterval [1.75,2]:[tex]f(x)=3^x-x^4\\\\f(1.75)=3^1^.^7^5-(1.75)^4=6.83-9.37=(-2.54)\\\\f(2)=3^2-(2)^4=9-16=(-7)[/tex]f(1.75) and f(2) have the same signs, this means there isn't a zero between the subinterval [1.75,2].The graph of the function shows that the answers are correct.