Evaluate x to the second power minus 3x x=-2
x^2 - 3x
4 - 6 -2
4 - 6 = -2
To evaluate the expression x^2 - 3x when x = -2, you need to substitute the value of x into the expression and simplify.
The expression x^2 - 3x represents a quadratic equation. To find the value when x = -2, substitute -2 for x in the expression:
(-2)^2 - 3(-2)
Now, simplify the expression using the order of operations (PEMDAS/BODMAS):
(-2)^2 is equal to 4 (because -2 multiplied by -2 equals 4).
-3(-2) is equal to +6 (because -3 multiplied by -2 equals +6).
So, the simplified expression becomes:
4 + 6
Add the values together:
= 10
Therefore, when x = -2, the value of x^2 - 3x is equal to 10.