Question

(3√7-1)²+(3-√7)²-(5-3√7)(2√7+3)-4(20-3√7)

Answer 1

Răspuns:

Explicație pas cu pas:

(3√7 - 1 )² + ( 3 - √7)² - ( 5 - 3√7)(2√7 + 3 ) - 4(20 - 3√7) =

= 9×7 - 2 ×3√7 + 1 + 9 - 6√7 + 7 - ( 10√7 - 6×7 + 15 - 9√7) - 80 + 12√7 =

= 63 - 6√7 + 10 - 6√7 + 7 - √7 + 27 - 80 + 12√7 =

= 80 - 12√7 - √7 + 27 - 80 + 12√7=

= 27 - √7

Answer 2

rad=radical

(3rad7-1)²+(3-rad7)²-(5-3rad7)(2rad7+3)-4(20-3rad7)

63-6rad7+1+9-6rad7-(10rad7+15-42-9rad7)-80+12rad7

63-6rad7+1+9-6rad7-(rad7-27)-80+12rad7

63-6rad7+1+9-6rad7-rad7+27-80+12rad7

27-6rad7-6rad7-rad7+12rad7

27-rad7