Find the possible values of the constant
k, if the roots of the quadratic equation
x-(k+2)x+4=0 are equal.
8. if a and b are the roots of the quadratic
equation px' +qx+r=0, express
(2++b? ) in terms p, q andr.
if y = 2x - 3x - 1, find the minimum
value of y and the corresponding value
ofx.
10. given that y = 2 - 3x - 4x, find the
maximum value of y and the value of x
at which y is maximum.

pls answer no 7,9 and10

Step-by-step explanation:

7

x - (k+2)x + 4

Since the roots are equal, b^2 - 4ac =0

a =x, b=k+2, c =4

(k+2)^2 - 4(1×4) =0

K^2 + 4k + 4-16 =0

K^2 +4k - 12=0

K^2 +6k - 2k - 12 =0

K(k + 6) - 2(k +6)=0

(k-2)(k +6) =0

K =2 or - 6

the answer is thin because within context, the stanza concludes the and frail tone the people have toward each other, and the fact that it would be thin, makes the most sense compared to "pliable" or "not hard or firm to the touch". hope this , good luck.

step-by-step explanation:

can i have brainliest

its 50 miles away from the starting point