Question

ayúdame con esta actividad a) 4(x-2)=12 b) 2(x²+1)=30 c) 3(x+4)=9 d) 5x²=20 e) 3x²=12x​

Answer 1

Respuesta:

$4(x - 2) = 12 \\ 4x - 8 = 12 \\ 4x = 12 + 8 \\ x = \frac{20}{4} \\ x = 5$

$2( {x}^{2} + 1) = 30 \\ 2 {x}^{2} + 2 = 30 \\ {x}^{2} = \frac{30 - 2}{2} \\ {x}^{2} = \frac{28}{2} \\ {x}^{2} = 14 \\ x = \sqrt{14}$

$3(x + 4) = 9 \\ 3x + 12 = 9 \\ 3x = 9 - 12 \\ x = \frac{ - 3}{3} \\ x = - 1$

$5 {x}^{2} = 20 \\ {x}^{2} = \frac{20}{5} \\ x = \sqrt{4} \\ x = 2$

$3 {x}^{2} = 12x \\ {x}^{2} = \frac{12x}{3} \\ {x}^{2} = 4x \\ \frac{ {x}^{2} }{x} = 4 \\ {x}^{2 - 1} = 4 \\ x = 4$