1. Suma wielomianów u(x)= -2x5+6x2+x-4 i v(x)= 3x5-6x3+x2-x+4 jest równa:
A. x5 + x2
B. x5 + x3
C. x5+ x3 + x2
D. x5 - 6x3 + 7x2

2. Oblicz ([tex]\sqrt{2}[/tex] - 1[tex])^{2}[/tex] + (2 + [tex]\sqrt{2}[/tex][tex])^{3\\}[/tex]


Odpowiedź :

Odpowiedź:

1. D

2. 23 + 12[tex]\sqrt{2}[/tex]

Szczegółowe wyjaśnienie:

1.

u(x) = -2x⁵ + 6x² + x - 4

v(x) = 3x⁵ - 6x³ + x² - x + 4

u(x) + v(x) = -2x⁵ + 6x² + x - 4 + 3x⁵ - 6x³ + x² - x + 4 = x⁵ -6x³ + 7x²

2.

(a+b)³ = a³ + 3a²b + 3ab² + b³

(a-b)²= a² - 2ab + b²

([tex]\sqrt{2}[/tex] - 1)² = 2 - 2[tex]\sqrt{2}[/tex] + 1

(2+[tex]\sqrt{2}[/tex] )³ = 8 + 3*4*[tex]\sqrt{2}[/tex] + 3*2*2 + 2[tex]\sqrt{2}[/tex] = 8 + 12[tex]\sqrt{2}[/tex] + 12 + 2[tex]\sqrt{2}[/tex] = 20 + 14 [tex]\sqrt{2}[/tex]

([tex]\sqrt{2}[/tex] - 1)² + (2+[tex]\sqrt{2}[/tex] )³ = 2 - 2[tex]\sqrt{2}[/tex] + 1 + 20 + 14 [tex]\sqrt{2}[/tex] = 23 + 12[tex]\sqrt{2}[/tex]