A=2b^3-1 what's the value of b if a is 13
A = 2b³ - 113 = 2b³ - 1+ 1 + 114 = 2b³ 2 2 7 = b³∛(7) = b
\(\sf~A=2b^3-1\)Plug in A = 13\(\sf~13=2b^3-1\)Add 1 to both sides:\(\sf~14=2b^3\)Divide 2 to both sides:\(\sf~7=b^3\)Find the cube root of both sides:\(\sf~b=\sqrt[3]{7}\)\(\sf~b\approx~1.91\)
