Question

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Answer 1

2x(x+3) - (x² + 4) = 
= 2x²+6x - x² - 4 = 
=  x²+6x-4 

Δ= 6²-4*1*(-4)= 36 + 16 = 52
√Δ = √52 = 2√13

x₁ = (-6 +2√13)/2*1= -3+√13
x₂ = (-6-2√13)/2 = -3 - √13