Question

Calcule o valor de X. ​

Answer 1

Resposta:

letra a

$24 \times 8 = 6 \times x \\ 6x = 192 \\ x = \frac{192}{6} \\ x = 32$

letra b

$x(x + 42) = 10 (10 + 30) \\ {x}^{2} + 42x = 400 \\ {x}^{2} + 42x - 400 = 0$

∆=(42)²-4.1.-400

∆=1764+1600

∆=3364

$x = \frac{ - 42 - 58}{2} = \frac{ - 100}{2} = - 50 \\ x = \frac{ - 42 + 58}{2} \frac{16}{2} = 8$

letra c

${x}^{2} = 6(6 + 18) \\ {x}^{2} = 144 \\ x = \sqrt{144} \\ x = 12$