The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):

sa = 2lw + 2wh + 2lh
sa = (2 x 2 x 1) + (2 x 1 x 2) + (2 x 2 x 2)
sa = (4) + (4) + (8)
sa = 16

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:

a² - 15a + 29 = -3a + 2
a² - 15a + 29 - 2 = -3a
a² - 15a + 3a + 27 = 0
a² - 12a + 27 = 0

Next, factor the quadratic equation:

a² - 12a + 27 = 0
(a - 3)(a - 9) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (a - 3) or (a - 9) must equal zero:

If (a - 3) = 0, a must equal 3
If (a - 9) = 0, a must equal 9

So the solution is that a = 3 or 9

The perimeter of a triangle is the sum of the lengths of its sides:

p = x + y + z
p = 7cm + 11cm + 14cm = 32cm

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.

9a x 9b = (9 x 9) (a x b) = 81ab

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.