Podéis resolverme el 30 a)?

Respuesta :

Explicación paso a paso : 30)a) <img src="https://tex.z-dn.net/?f=x%5E%7B4%7D-2x%5E%7B2%7D%2B1%3D0" />(x² - 1)² = 0x² - 1 = 0(x + 1) (x - 1) = 0x + 1 = 0 x - 1 = 0x = - 1 x = 1b)<img src="https://tex.z-dn.net/?f=x%5E%7B4%7D" /> + 2x² + 1 = 0(x² + 1) = 0x² = - 1x = <img src="https://tex.z-dn.net/?f=%5Csqrt%7B-1%7D" />no tiene soluciones realesc)<img src="https://tex.z-dn.net/?f=x%5E%7B4%7D" /> + 5x² - 6 = 0(x² + 6) (x² - 1) = 0x² + 6 = 0 x² - 1 = 0x² = - 6 x² = 1x = <img src="https://tex.z-dn.net/?f=%5Csqrt%7B-6%7D" /> x = ±<img src="https://tex.z-dn.net/?f=%5Csqrt%7B1%7D" />para <img src="https://tex.z-dn.net/?f=%5Csqrt%7B-6%7D" /> no existen raíces realeslas raíces reales son 1 y - 1d)<img src="https://tex.z-dn.net/?f=x%5E%7B4%7D" /> - 125x² + 484 = O + 81x² - 81x²____________________________<img src="https://tex.z-dn.net/?f=x%5E%7B4%7D" /> - 44x² + 484 - 81x² = 0(x² - 22)² - 81x² = 0(x² - 22 + 9x) (x² - 22 - 9x) = 0(x² + 9x - 22) (x² - 9x - 22) = 0(x + 11) (x - 2) (x - 11) (x + 2) = 0x + 11 = 0 x - 2 = 0 x - 11 = 0 x + 2 = 0x = - 11 x = 2 x = 11 x = - 2.