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The trinomial $9x^2+12x+4$ is a perfect square trinomial, because it's discriminant is equal to zero
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$\Delta=b^2-4ac=12^2-4\left(-9\right)\left(-4\right) = 0$
Learn how to solve quadratic equations problems step by step online. Solve the quadratic equation -9x^2+12x+-4=0. The trinomial 9x^2+12x+4 is a perfect square trinomial, because it's discriminant is equal to zero. Using the perfect square trinomial formula. Factoring the perfect square trinomial. Multiply both sides of the equation by -1.