The first step to solve a quadratic expression that's not set to zero is to solve the equation so that it is set to zero:

b² - 2b - 5 = b - 1
b² - 2b - 5 + 1 = b
b² - 2b - b - 4 = 0
b² - 3b - 4 = 0

Next, factor the quadratic equation:

b² - 3b - 4 = 0
(b + 1)(b - 4) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (b + 1) or (b - 4) must equal zero:

If (b + 1) = 0, b must equal -1
If (b - 4) = 0, b must equal 4

So the solution is that b = -1 or 4

The perimeter of a triangle is the sum of the lengths of its sides:

p = x + y + z
p = 5cm + 5cm + 10cm = 20cm

The area of a triangle is equal to ½ base x height:

a = ½bh
a = ½ x 4 x 3 = \( \frac{12}{2} \) = 6

The entire length of this line is represented by AD which is AB + BD:

AD = AB + BD

The surface area of a cylinder is 2πr² + 2πrh:

sa = 2πr² + 2πrh
sa = 2π(2²) + 2π(2 x 2)
sa = 2π(4) + 2π(4)
sa = (2 x 4)π + (2 x 4)π
sa = 8π + 8π
sa = 16π