# What is a difference of cubes?

## What is a difference of cubes?

Sum or Difference of Cubes A polynomial in the form a 3 + b 3 is called a sum of cubes. A polynomial in the form a 3 – b 3 is called a difference of cubes.

**What is a sum of cubes?**

A polynomial in the form a 3 + b 3 is called a sum of cubes. A polynomial in the form a 3 – b 3 is called a difference of cubes.

### What is the formula for sum of cubes?

The sum of cubes formula is one of the important algebraic identity. It is represented by a3 + b3 and is read as a cube plus b cube. The sum of cubes (a3 + b3) formula is expressed as a3 + b3 = (a + b) (a2 – ab + b2).

**What’s the difference between 700C and 28 inch rims?**

Size stamp says 28 x 1 3/8 x 1 5/8. Rain magnet. Costa Clyde. Tyre sizing can be a complex subject as many different standards have been used but you should have 700c (622mm) rims. I’d be genuinely surprised if you don’t. Some tyres for these are marked as 28″.

## Which is better a 29er or a 700c?

The 29ers can have wider rims and hubs, so check the dropout clearance prior to ordering. We have not yet had a 700C, 28″ or 29er that has been incompatible. So long as you select the 700C listing and use the tire that was on your wheel, your 29er will make a great electric bike.

**What does 700 mean on a bike tire?**

“700” is the overall diameter of the bike tire, measured in millimeters. “28” is the width of the tire, again in millimeters and “c” refers to the width code of the tire (like you’d see when you look at your bike either from behind or in front).

### Do you need 100 psi for a 700×28 tire?

Most people should be running a significantly lower pressure than what is marked for a properly inflated tire — the tire deflects a bit, but has good rolling resistance and hazard+shock absorption properties. Even if you’re ~250 lbs with bike+yourself, you’re not going to need 100 PSI on a 700×28.