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:

c² - 2c - 58 = c - 4
c² - 2c - 58 + 4 = c
c² - 2c - c - 54 = 0
c² - 3c - 54 = 0

Next, factor the quadratic equation:

c² - 3c - 54 = 0
(c + 6)(c - 9) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (c + 6) or (c - 9) must equal zero:

If (c + 6) = 0, c must equal -6
If (c - 9) = 0, c must equal 9

So the solution is that c = -6 or 9

The slope of this line is the change in y divided by the change in x. The endpoints of this line segment are at (-2, -4) and (2, 6) so the slope becomes:

A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.

The formula for area is πr². Radius is circle \( \frac{diameter}{2} \):

r = \( \frac{d}{2} \)
r = \( \frac{8}{2} \)
r = 4
a = πr²
a = π(4²)
a = 16π

Parallel lines are lines that share the same slope (steepness) and therefore never intersect. A transversal occurs when a set of parallel lines are crossed by another line. All of the angles formed by a transversal are called interior angles and angles in the same position on different parallel lines equal each other (a° = w°, b° = x°, c° = z°, d° = y°) and are called corresponding angles. Alternate interior angles are equal (a° = z°, b° = y°, c° = w°, d° = x°) and all acute angles (a° = c° = w° = z°) and all obtuse angles (b° = d° = x° = y°) equal each other. Same-side interior angles are supplementary and add up to 180° (e.g. a° + d° = 180°, d° + c° = 180°).