9xsquared + 12x = - 4

x = - 0.67

Step-by-step explanation:

Step 1:

Solve for x using quadratic formula for the equation 9x² + 12x + 4 = 0

Here, a = 9, b = 12 and c = 4

⇒ x = ( - b ±√b² - 4ac) / 2a

⇒ x = (-12 ±√144 - 4*9*4) / 18

⇒ x = (-12 ±0) / 18 = - 12/18 = - 2/3

⇒ x = - 0.67