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.

2a⁹ + 2a⁹ = 4a⁹

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 + 3c - 3 = 3c + 1
c² + 3c - 3 - 1 = 3c
c² + 3c - 3c - 4 = 0
c² - 4 = 0

Next, factor the quadratic equation:

c² - 4 = 0
(c - 2)(c + 2) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (c - 2) or (c + 2) must equal zero:

If (c - 2) = 0, c must equal 2
If (c + 2) = 0, c must equal -2

So the solution is that c = 2 or -2

The slope-intercept equation for a line is y = mx + b where m is the slope and b is the y-intercept of the line. From the graph, you can see that the y-intercept (the y-value from the point where the line crosses the y-axis) is 1. The slope of this line is the change in y divided by the change in x. The endpoints of this line segment are at (-2, -1) and (2, 3) so the slope becomes:

Plugging these values into the slope-intercept equation:

y = x + 1

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.

4a² - 2a² = 2a²

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.