Find the discrimanant and the number of real roots for this equation 9x^2+12x+4=0

For this case we have that by definition, the discriminant of a quadratic equation , is given by:

: Two different real roots

: Two equal real roots

: Two different complex roots

If we have , then:

Substituting the values:

Thus, we have two equal real roots.

We have two equal real roots.

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

step-by-step explanation:

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