To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

8a³ - 4a³ = 4a³

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 - 2c - 26 = -3c + 4
c² - 2c - 26 - 4 = -3c
c² - 2c + 3c - 30 = 0
c² + c - 30 = 0

Next, factor the quadratic equation:

c² + c - 30 = 0
(c - 5)(c + 6) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (c - 5) or (c + 6) must equal zero:

If (c - 5) = 0, c must equal 5
If (c + 6) = 0, c must equal -6

So the solution is that c = 5 or -6

The area of a triangle is equal to ½ base x height:

a = ½bh
a = ½ x 5 x 6 = \( \frac{30}{2} \) = 15

The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 61° - 62° = 57°

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.

7a x 6b = (7 x 6) (a x b) = 42ab