Question

cine ma ajuta si pe mn ex 39 si 40

Answer 1

39. a) 3 + 3√3 + √(5+3√3)² - √(1+√3)² = 3+3√3 + 5+ 3√3 - 1-√3 = 7+ 5√3
b) 1 - 7 + 4√7 - 4 + 7 + 6√7 +9 = 6 + 10√7
40. a) 3(x+2)² - (x-1)² + 2(x-3)(x +3) = 3x² + 12x + 12 - x² + 2x - 1 +2x² - 18  = 
= 4x² + 4x - 7
b)  (2x-1/2)² +(3x+1)² -(2x/3 - 5)(2x/3 + 5) = 4x²- 2x - 1/4 + 9x² +6x + 1 - 4x²/9 +25 = (13+4/9)·x²+4x + 26- 1/4 = 121/9 ·x² + 4x + 103/4
c)  16x² - 8xy +y² +4x² - 25y² - 27x² - 18xy - 3y² = -7x² - 26xy - 27y²
d)3x² + 2√3x + 1 + 10x²-2 - 3x² +4√3x - 4 = 10x² + 6√3x - 5
e) 3 - 4√3x + 4x² - 15 - 6√5x + 3x² - 6x² + 36 = x² - 2(2√3 + 3√5)x + 24