Question

Resolva as equações.
a) x2=49

b)x2-289=0

c) 47+6x2-101

d)x2+64=0

Answer 1

$a) {x}^{2} = 49 \\ x = \sqrt{49} \\ x = 7 \\ \\ b) {x}^{2} -289=0 \\ {x}^{2} = 289 \\ x = \sqrt{289} \\ x = 17 \\ \\ c) 47+6 {x}^{2} -101 \\ 6 {x}^{2} = 101 - 47 \\ 6 {x}^{2} = 54 \\ {x}^{2} = \frac{54}{6} = 9 \\ x = \sqrt{9} \\ x = 3 \\ \\ </p><p>d) {x}^{2} +64=0 \\ {x}^{2} = 64 \\ x = \sqrt{64} \\ x = 8$