7) Select two that apply (2 points). Which of the following has a discriminant of 9?
a] f(x) = 3x² - 6x+4
b] f (x) = 2x² - 7x+5
c] f(x)=x² +5x+4
d] f (x) = 7x? - 8x+2

divide by 5

step-by-step explanation:

60/5 = 12

7

step-by-step explanation:

step-by-step explanation:

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