Question

Quanto é 5 x elevado a 2 + 4 x elevado a 3 + 2x + 3 = 0​

Answer 1

$5x^2+4x^3+2x+3=0\\\\4x^3+5x^2+2x+3=0\\\\\frac{4x^3+5x^2+2x+3}{x+1.30663\dots }=4x^2-0.22652\dots x+2.29598\dots \\\\4x^2-0.22652\dots x+2.29598\dots \approx \:0\\\\solucao\\\\x\approx \:-1.30663\dots$