Question

Find the value of the cubic polynomial x3 – 5x2 + 8x-4 if: x = 1/8-root60

Answer 1

Answer:The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try!