Question

A)ײ-49=0
B)ײ=1
C)2ײ-50=0

Answer 1

Resposta:

$A)\\ x^2-49=0\\ \\ x^2=49\\ \\ x=\pm\sqrt{49} \\ \\ x=\pm7\\ \\ S=\{-7,+7\}$

--------------------------------------

$B)\\ x^2=1\\ \\ x=\pm\sqrt{1} \\ \\ x=\pm1\\ \\ S=\{-1,+1\}$

----------------------------------------

$C)\\ 2x^2-50=0\\ \\ 2x^2=50\\ \\ x^2={50\over2}\\ \\ x^2=25\\ \\ x=\pm\sqrt{25} \\ \\ x=\pm5\\ \\ S=\{-5,+5\}$