Question

x²-49=0
x²=1
2x²-50=0 
7x²-7=0

Answer 1

x²-49=0
x² = 49
x =  ± √49
x = ± 7

S{-7 ; +7}


x²=1
x= ± √1
x= ± 1

S{ -1 ; +1}


2x²-50=0  ÷ 2
x² -25=0
x² = 25
x = ± √25
x = ± 5

S{-5 ; +5}


7x²-7=0   ÷ 7
x² -1 =0
x² = +1
x=  ± √1
x =  ± 1

S{ -1 ; +1}

Answer 2

Olá Cássia,

x²-49=0
x² = 49
x =  √49
x = + 7, -7

S{-7 ; +7}


x²=1
x=  √1
x= + 1, -1

S{ -1 ; +1}


2x²-50=0  Simplifica por 2
x² -25=0
x² = 25
x = √25
x = + 5, -5

S{-5 ; +5}


7x²-7=0   Simplifica por 7
x² -1 =0
x² = +1
x=   √1
x = + 1, -1

S{ -1 ; +1}