How do unsaturated phospholipid fatty acid tails affect plasma membrane fluidity?

A phospholipid is made of glycerol, two the fatty acid tails, and a phosphate-linked head group. More unsaturated fatty acids it means less tightly packed phospholipids its results to the greater membrane fluidity. Unsaturated fatty acids are naturally occurring, meaning that the remaining hydrogen is on the same side of the molecule and result in a bending of the hydrocarbon chain. 

The discriminant () of a quadratic equation ax² + bx + c = 0 is written as b² - 4ac.

If Δ > 0, you will have two real roots.
If Δ = 0, you will have one real root.
If Δ < 0, you will have two complex roots.

Why? Let's take a look at the quadratic equation:



(Assuming a, b, and c are all real)
See the discriminant inside the square root?
If it's positive, we'll be left with a real number.
If it's negative, what's inside the root is imaginary, and so our solution is complex.
If it's equal to 0, we only get one solution. (plus/minus 0 has no effect)

If the discriminant of a quadratic equation is 4, B) There are two real roots.