To solve this equation, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)

-2c(c - x)
-2(-1)(-1 - 1)
-2(-1)(-2)
(2)(-2)
-4

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:

z² - 5z + 6 = 5z - 3
z² - 5z + 6 + 3 = 5z
z² - 5z - 5z + 9 = 0
z² - 10z + 9 = 0

Next, factor the quadratic equation:

z² - 10z + 9 = 0
(z - 1)(z - 9) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (z - 1) or (z - 9) must equal zero:

If (z - 1) = 0, z must equal 1
If (z - 9) = 0, z must equal 9

So the solution is that z = 1 or 9

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.

6a⁷ + 3a⁷ = 9a⁷

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

a = l x w
a = a x b
a = 8 x 1
a = 8

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.

8a + 4a = 12a