Question

b) (x - 2)2 = 15
c) (x + 5)2 - 3 = 0
me ajudem nessa ai ,pfvzinho...​

Answer 1

B)

(x-2)2 = 15

2x - 4 = 15

2x = 19

x = 19/2 ou 9,5

C)

(x+5)2 -3 = 0

2x + 10 - 3 = 0

2x + 7 = 0

2x = -7

x = -7/2 ou -3,5

Answer 2

Explicação passo-a-passo:

$\blue {{ _{\heartsuit} } \heartsuit_{\heartsuit} } \: \: \mathsf {OI, TUDO \: \: J\acute{O}IA \: ? \: \:\blue {{ _{\heartsuit} } \heartsuit_{\heartsuit} } }$

b)

$\Large \bf{(x - 2)2 = 15} \\ \Large \bf{2(x - 2) = 15} \\ \Large \bf{2x - 4 = 15} \\ \Large \bf{2x = 15 + 4} \\ \Large \bf{2x = 19} \\ \red {\boxed{\Large \bf{x = \frac{19}{2} }}} \\ \bf{ou} \\ \red {\boxed{\Large \bf{x = 9,5}}}$

c)

$\Large \bf{(x + 5)2 - 3 = 0} \\ \Large \bf{2x + 10 - 3 = 0} \\ \Large \bf{2x + 7 = 0} \\ \Large \bf{2x = - 7} \\ \red {\boxed{\Large \bf{x = - \frac{7}{2} }}} \\ \bf{ou} \\ \red {\boxed{\Large \bf{x = - 3,5}}}$

$\mathcal{ATT : ARMANDO}$