Question

Calcule o valor do ×

Answer 1

c)

x² = l² + l²

x² = 2l²

x = √2l²

x = l√2

x = 3√2

d)

(x +1)² = (x +2)² + x²

x² +2x +1 = x² +4x +4 +x²

x² +2x -4x +1 -4 = 0

x² -2x -3 = 0

D = { 1 , 3}

(3) + (-1) = 2

x > 0 ∴ x = 3

e)

x² +2x +1 = x² +9

2x = 9 -1

x = 8/2

x = 4

f)

4x² = x² +(3 * √3)²

3x² = 3² * √3²

x² = (9 * 3)/3

x = ±√9

x = 3