Question

Va rog sa mi rsspundeti!!

x=3√18-√72
x=?
x²=?

Answer 1

x=3√18-√72
x = 9√2 - 6√2
x = 3√2

x² = (3√2)²
x² = 18

Answer 2

x = 3√18 - √72 = 3√(9*2) - √(36*2) = 9√2 - 6√2 = 3√2 ;

x² = (3√2)² = 9*2 = 18 ;