Answer :
[tex]\sf~A=2b^3-1[/tex]
Plug in A = 13
[tex]\sf~13=2b^3-1[/tex]
Add 1 to both sides:
[tex]\sf~14=2b^3[/tex]
Divide 2 to both sides:
[tex]\sf~7=b^3[/tex]
Find the cube root of both sides:
[tex]\sf~b=\sqrt[3]{7}[/tex]
[tex]\sf~b\approx~1.91[/tex]
Plug in A = 13
[tex]\sf~13=2b^3-1[/tex]
Add 1 to both sides:
[tex]\sf~14=2b^3[/tex]
Divide 2 to both sides:
[tex]\sf~7=b^3[/tex]
Find the cube root of both sides:
[tex]\sf~b=\sqrt[3]{7}[/tex]
[tex]\sf~b\approx~1.91[/tex]
