The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

x² - 2x - 63 = 0
(x + 7)(x - 9) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (x + 7) or (x - 9) must equal zero:

If (x + 7) = 0, x must equal -7
If (x - 9) = 0, x must equal 9

So the solution is that x = -7 or 9

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

2a x 6b = (2 x 6) (a x b) = 12ab

A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).

A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r²h and the surface area is 2(π r²) + 2π rh.

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