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We expand this term by term.
To make sure we expand every term, I use the beak method. To do this, draw 2 curves over the equation from the 3x to the x, and then a second curve from the x to the +2.
Then draw 2 more curves, this time under the equation, from the 3x to the -5, and the second from the -5 to the +2.
You will notice the lines make an outline of a beak.
Now we are ready to multiply all of the lines.
3x * x = 3x2
x * 2 = 2x
3x * -5 = -15x
5 * 2 = -10
Now we simply add all of these calculated terms together:
We can do one step of simplification as there are two x terms:
This now gives us the final answer: