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

To solve this equation, isolate the variable for which you are solving (a) on one side of the equation and put everything else on the other side.

-2a - 2z = -4a - 3z + 3
-2a = -4a - 3z + 3 + 2z
-2a + 4a = -3z + 3 + 2z
2a = -z + 3
a = \( \frac{-z + 3}{2} \)
a = \( \frac{-z}{2} \) + \( \frac{3}{2} \)
a = -\(\frac{1}{2}\)z + 1\(\frac{1}{2}\)

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

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 + 7c - 23 = 4c - 5
c² + 7c - 23 + 5 = 4c
c² + 7c - 4c - 18 = 0
c² + 3c - 18 = 0

Next, factor the quadratic equation:

c² + 3c - 18 = 0
(c - 3)(c + 6) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (c - 3) or (c + 6) must equal zero:

If (c - 3) = 0, c must equal 3
If (c + 6) = 0, c must equal -6

So the solution is that c = 3 or -6

A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.