Question

Calculați x², pentru:
a) x=√2+√8
c) x=4√20-3√45​

Answer 1

Răspuns:

${x}^{2} = 2 + 8 + \sqrt{2 \times 8} = 10 + 4 = 16 \\ {x}^{2} = 16 \times 20 + 9 \times 45 - 12 \sqrt{20 \times 45 } = 320 + 405 - 360 = 365$