# Solve

One dimension of a cube is increased by one inchto form of a rectangular block. Suppose that the volume of the new block is 150 cubic inches. Find the length of an edge of the original cube.[email_link]

http://solvemaths.in/solve-3/AlgebraOne dimension of a cube is increased by one inchto form of a rectangular block. Suppose that the volume of the new block is 150 cubic inches. Find the length of an edge of the original cube.

Rajni
Sahsah.rajni@yahoo.comAdministratorSOLVE - ΜΔΓΗŠ
Therefore, the length of sides of the original cube = x = 5 inches.

How do you get that -3?

X=5 is one of the roots for the eqn.

The other two roots are imaginary, viz. (-3+4.58i) and (-3-4.58i)

You can ignore those values.

For x=5, since the function becomes 0, (x-5) is one of the roots. Then divide the function by (x-5) to get remaining roots.

You can further factorize x^2+6x+30 and get the imaginary of roots.

see below