Question

d) 4x elevado a 2 - 16=0 ajudem por favor

Answer 1

x=2

4x²-16=0

4x²=16

x²=16/4

x²=4

$x = \sqrt{4}$

x=2

Answer 2

$4x {}^{2} - 16 = 0 \\ 4x {}^{2} -16 = 0 \\(4x {}^{2} - 16) \div 4 = 0 \div 4 \\ 4x {}^{2} \div 4 - 16 \div 4 = 0 \div 4 \\ (4x {}^{2} - 16) \div 4 = 0 \div 4 \\ 4x {}^{2} \div 4 - 16 \div 4 = 0 \\ x {}^{2} - 16 \div 4 = 0 \\ 4x {}^{2} \div 4 - 16 \div 4 = 0 \\ x {}^{2} - 4 = 0 \\ 4x {}^{2} - 16 = 0 \\ x {}^{2} - 4 = 0 \\ x {}^{2} - 4 + 4 = 0 + 4 \\ x {}^{2} = 0 +4 \\ x {}^{2} - 4 + 4 = 0 + 4 \\ x {}^{2} = 4 \\ x {}^{2} - 4 = 0 \\x {}^{2} = \sqrt{4} \\ x = + \sqrt{4} \\ x = + 2 \\ x {}^{2} = 4 \\ x = + 2 \\ x = - 2 \\ x = 2 \\ x _{1} = - 2. \: x_{2} = 2 \\ resposta \\ x_{1} = - 2 . \: \: x _{2} = 2$