Zad 1. Rozwiąż układ równań:
3x+4y = 6
-x +2y= 3
Zad 2. Dane są wielomiany:
P(x) = x³-2x²- x +3 oraz Q(x)= 5x²+2x- 1.
Oblicz:
a) P(x) + Q(x)
b) P(x) - Q(x)
c) P(x) · Q(x)
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Zadanie 1.
Zadanie 2
P(x) = x³-2x²- x +3
Q(x)= 5x²+2x- 1
a)
P(x)+Q(x)=
=(x³-2x²- x +3 )+( 5x²+2x- 1 )=
=x³-2x²- x +3 + 5x²+2x- 1 =
=x³+3x²+x+2
b)
P(x)-Q(x)=
=(x³-2x²- x +3 )-( 5x²+2x- 1 )=
= x³-2x²- x +3 - 5x²-2x +1 =
=x³ -7x² -3x+4
c)
P(x)·Q(x)=
=(x³-2x²- x +3 )·( 5x²+2x- 1)=
= x³·5x²+x³·2x+x³·(-1) -2x²·5x²-2x²·2x-2x²·(-1) -x·5x²-x·2x-x·(-1) +3·5x²+3·2x+3·(-1)=
=5x⁵+2x⁴-x³ -10x⁴-4x³+2x²-5x³-2x²+x +15x²+6x-3 =
=5x⁵ -8x⁴ -10x³ +15x²+7x-3
Pozdrawiam:)