Răspuns: [ex 8]
a) x = 3√2 - 5√2
x = -2√2
x² = (-2√2)²
x² = (-2)² × (√2)²
x² = 4 × 2 -› x² = 8
d) x = 5√24 - 2√54
x = 5 × 2√6 - 2 × 3√6
x = 10√6 - 6√6 -› x = 4√6
x² = (4√6)²
x² = 4² × (√6)²
x² = 16 × 6 -› x² = 96
b) x = 7√3 - 3√3
x = 4√3
x² = (4√3)²
x² = 4² × (√3)²
x² = 16 × 3 -› x² = 48