what are the solutions to the equation x2 − 1 = 399?

x=200

Step-by-step explanation:

If you have x2-1=399 You first have to take the -1 and make it positive to cancel it from both sides so..

X2-1(+1)=399(+1)

Now your left with X2=400 now divide each side by 2 to cancel out the combined X2

So X2/2=400/2

Which equals X=200

(0.2)+(-8)=0.3+-3+0.3m is the equation i guess? ?

step-by-step explanation:

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.