Use cross products to identify the equation needed to solve this proportion. 5. 2
- = -
x. 9

A. 5x=18
B. 2x=45
C. 9x=10
D. 2x=14

Please help asap!!​

idk

step-by-step explanation:

answer: its the third option.

step-by-step explanation:

i just took the test.

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