Respuesta:
a) [tex]\sqrt{21}[/tex]
b) 9 /10
c) -11/2
Explicación paso a paso:
a) [tex]x^{2}[/tex] + 4 = 5 * 5
[tex]x^{2}[/tex] = 25 - 4 = 21
x = [tex]\sqrt{21}[/tex]
b) 9x - 7 = 4 - x - 2
9x + x = 4 - 2 + 7
10 x = 9
x = 9/10
c) 3(2x + 2)= -1 - (4 - 4x)
6x + 6 = -1 - 4 + 4x
6x - 4x = -5 - 6
2x = -11
x = -11/2
