PLEASE HELP AND ANSWER THESE! Directions: Write the written form of the following expressions given in the symbolic form, then simplify each expression.

9.4(3x + 2) - 9

10. √144 - (6^2-x)

11. (28 ÷ 4) – (x + 7)

12. x^3 - 4y - (6 + 2)

13. (64 ÷ 8) – (x • 6)

14. 7^2 (4 - 15x)

15. 4(√144 +9^3)–y

16.5^4 + 7y - (8 + 9x)

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

hope this !

let me know

hm let me think hm think think hm think yes

yep b and c r the correct got it! : )