geno3141

2x² - 12x + 8

Start by factoring out the common factor:

2(x² - 6x + 4)

When factored it will look like this:    2(x -   )(x -   )

The two numbers that you need must have a product of 4 and a sum of 6. 

There aren't two whole numbers that work; if factored, they will be square roots.

I would suggest using this proportion:   RAD / π  =  DEG / 180°

If you have 4.56 radians:     4.56 / π  =  DEG / 180°     --->     DEG  =  4.56 * 180° / π   =    261.3°

OR:  Always multiply the radians by 180°/π 

The graph for standard deviation is perfectly symmetrical around the mean.

If 68% of the scores lie between -1 and + 1, half of them, that is 34% will lie between 0 and +1, and the other 34% of them will lie betweeen -1 and 0.

A rational number is any number that can be written as a common fraction.

As a decimal fraction, it either terminates (as 6, -3 1/2, and 7/20 do) or it infinitely repeats (as 1/3, 5 3/7, and -4 5/9 do).

Technically, a rational number is any number that can be put into the form  a/b,  where a and b are both integers and b ≠ 0.

The integers form this set:   { ..., -4, -3, -2, -1, 0, 1, 2, 3, 4, ...}.

First, at the bottom left-hand corner, make certain that the calculator is in degree mode or radian mode, whichever you want.

Then, hit the (2nd) key at the top-left-hand side.

Below the (2nd) key is the (asin) key, which is the inverse sine key.

Enter the value.

Hit the equal sign.

Teh calculator at this site will handle this problem quite nicely.

Use any scientific calculator (including the one at this site) to find invcos.

However, there is a problem here: the cos can never have a value larger than one, or smaller than -1. Here, the value is 1.411..., an impossible situation.

I would suggest that you look again at how the problem was set up; there's a mistake somewhere.

Is the right angle at E or is it at F?

Either way, use the Pythagorean Theorem (but it will be used differently, depending upon the location of the right angle).

∞  =  ∞²  =  ∞³  =  ∞^4  =  ∞^5  ...  =  ∞^∞

In your right triangle, the side PR is opposite angle Q and the side RQ is adjacent to angle Q.

The function, tan is defined to be:  tan  =  opp / adj.

tan(Q)  =  PR / RQ     --->     tan(Q)  =  6.2 / 8  =  0.775

To solv for angle Q, use invtan:     Q  =  invtan(0.775)  =  65.9 degrees.