Omrayer
Lake Schools
C19-FL-1200310-Algebra 1 Q4 Part A
English
V
MADISON WA
10
The graph of the function f(x) = (x - 3)(x + 1) is shown.
Which describes all of the values for which the graph is
positive and decreasing?
o
all real values of x where x <-1
all real values of x where x <1
all real values of x where 1 all real values of x where x>3
do
-10
8
6
4
-2
4
6
8
10
x
+
+
71
+
+
+

i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct