Respuesta :

ghanami

Answer:

Step-by-step explanation:

3x² +9x=-4 means : 3x² +9x+4=0

a=3 and b=9 and c= 4

Δ : b²-4ac       Δ = 9²-4(3)(4) = 81 - 48 = 33

Solution of a quadratic equation ax² + bx + c = 0

x = [-b ± v(b² - 4ac)]/2a    

Δ = b²- 4ac            ........continu                                                                            

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good job