Find the value of x^3+¡¼2x¡½^2-3 when x =3.
I don't know how to type x to the 3rd power it keeps putting a little triangle there. How do I do this? When I type it here or in word it does the same thing. Help!
your x^3 came out ok,
it is the term in the middle that I can't figure out.
To represent "x to the power of 3" or "x cubed," you can use the caret symbol (^) on a keyboard. To type it, simply press Shift and the number 6 key at the same time. So in this case, you can write x^3.
Back to the main question, you need to substitute the value of x (which is 3) into the expression x^3 + 2x^2 - 3. Let's do that:
When x = 3, the expression becomes:
3^3 + 2(3)^2 - 3.
Now, let's simplify it step by step:
3^3 means 3 raised to the power of 3, which can be calculated as follows: 3 * 3 * 3 = 27.
Next, calculate (3)^2: 3 * 3 = 9.
Plugging these values back into the expression, we have:
27 + 2(9) - 3.
Now, perform the multiplication: 2 * 9 = 18.
Simplify further:
27 + 18 - 3.
Now, perform the addition and subtraction: 27 + 18 = 45, and then 45 - 3 = 42.
Therefore, when x = 3, the value of the expression x^3 + 2x^2 - 3 is 42.