Question

7 x ao quadrado - 28 = 0

Answer 1

7x^2 - 28=0
7x^2= 28
X^2= 28/7
X^2= 4
X= ± raiz quadrada de 4
X= ± 2

Answer 2

7x²-28=0
7x²=0+28
7x²=28
x²=28/7
x²=4
x=√4
x1=2
x2=-2