An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.

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

y² + 6y + 9 = 0
(y + 3)(y + 3) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, (y + 3) must equal zero:

If (y + 3) = 0, y must equal -3

So the solution is that y = -3

A cube is a rectangular solid box with a height (h), length (l), and width (w). The volume is h x l x w and the surface area is 2lw x 2wh + 2lh.

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.

a - 6z = -7a - z - 3
a = -7a - z - 3 + 6z
a + 7a = -z - 3 + 6z
8a = 5z - 3
a = \( \frac{5z - 3}{8} \)
a = \( \frac{5z}{8} \) + \( \frac{-3}{8} \)
a = \(\frac{5}{8}\)z - \(\frac{3}{8}\)

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.

-8z - 6 = -4 + 9z
-8z = -4 + 9z + 6
-8z - 9z = -4 + 6
-17z = 2
z = \( \frac{2}{-17} \)
z = -\(\frac{2}{17}\)