The equation x2 − 9 = 0 has real solution(s). answer is 2

The given equation has 2 real solutions.

Step-by-step explanation:

If a quadratic equation is in the form of ax²+ bx + c = 0

The the roots of this equation will be real if (b²- 4ac) > 0

Now we have been given an equation x²- 9 = 0

This equation can be written as 1.x² + 0.x + (-9) = 0

Here a = 1

b = 0

and c = -9

Now we will calculate the value of (b² - 4ac)

(b² - 4ac) = 0 - (4)(1)(-9)

               = 36 > 0

Therefore, The solution of the given equation will be 2 and real.

Now we factorize it to check the answer.

x² - 9 = 0

(x - 3)(x + 3) = 0

x -3 = 0

x = 3

Or (x + 3) = 0

x = -3

Therefore, equation has 2 real so;utions.

heyyy

step-by-step explanation:

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.