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OK, you just have to put those values into the equation, do the math, and see if it works.
-6 * 5/6 - 7 * (-2) = 9 does it?
-5 - (-14) = -5 + 14 = 9 yes it does
You can (and probably should) always check a solution by testing this way. The definition of a solution is a value or set of values that cause the equation to work out. If the test had failed (say we had gotten -6 = 9 before, which is obviously wrong), we'd know that the values weren't a solution.
5x -2(x-2) = 6 -2(-3x-3) 5x -2x +4 = 6 +6x +6 (use the distributive property) 3x + 4 = 6x + 12 (collect terms) 4 = 3x + 12 (subtract 3x from both sides to get all x on one side) -8 = 3x (subtract 12 from both sides to get only x on one side) -8/3 = x (divide both sides by 3 to get x by itself)
The first step here is to draw a rough sketch of the two curves, and find the two points they meet. If you set x^3-6x^2+8x = x^3-4x, then you can rearrange this into the quadratic equation 6x^2-12x = 0. Solving this tells you x=0 or 2 : these are the two x values where the curves meet, and they give the bounds on your integral.
When you sketch the curves, you'll see that x^3-4x is below x^3-6x^2+8x, so the thing you need to integrate is (x^3-6x^2+8x)-(x^3-4x), that is, 12x-6x^2. If you integrate this from 0 to 2, you'll have the answer you need!
6x+6=4x+12
Since 4x contains the variable to solve for, move it to the left-hand side of the equation by subtracting 4x from both sides. 6x+6-4x=12
Since 6x and -4x are like terms, add -4x to 6x to get 2x. 2x+6=12
Since 6 does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting 6 from both sides. 2x=-6+12
Add 12 to -6 to get 6. 2x=6
Divide each term in the equation by 2. (2x)/(2)=(6)/(2)
Simplify the left-hand side of the equation by canceling the common factors. x=(6)/(2)
Simplify the right-hand side of the equation by simplifying each term. x=3
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