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).

The area of a rectangle is equal to its length x width:

a = l x w
a = a x b
a = 3 x 7
a = 21

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:

y² - 7y + 6 = -3y + 2
y² - 7y + 6 - 2 = -3y
y² - 7y + 3y + 4 = 0
y² - 4y + 4 = 0

Next, factor the quadratic equation:

y² - 4y + 4 = 0
(y - 2)(y - 2) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, (y - 2) must equal zero:

If (y - 2) = 0, y must equal 2

So the solution is that y = 2

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

z² + 16z + 64 = 0
(z + 8)(z + 8) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, (z + 8) must equal zero:

If (z + 8) = 0, z must equal -8

So the solution is that z = -8

A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.