Question

resolva as equações do 2 grau
a)4x²-36=0
b)7x²-21=0

Answer 1

a)
4x^2 - 36 = 0
4x^2 = 36
x^2 = 36 ÷ 4
x^2 = 9
x = raiz quadrada de 9
x = 3.

b)
7x^2 - 21 = 0
7x^2 = 21
x^2 = 21 ÷ 7
x^2 = 3
x = raiz quadrada de 3
x = 1,17777...

Answer 2

a) 4x^2-36=0 4x^2= 36 x^2=36/4 x^2 = 9 x = +ou - √9 x= +ou - 3 b) 7x^2 -21=0 7x^2 = 21 x^2=21/7∴ x^2 = 21/7 x= +ou- √3