Question

Oblicz wartości liczbowe wyrazeń: a)3(xdo kwadratu-2x+3)-2(xdo kwadratu-5x-1) dla x=2 b)a(2ab+b)-b(a-2ab+a do kwadratu) dla a=0,1 i b= -10

Answer 1

a) 9 - 6x + 9 - 4x + 10x + 2

9 - 12 + 9 - 8 + 20 + 2 = 20

 

b) 2a do potęgi 2 b + ab - ba + b a do kwadratu

- 4 + 0,1 * - 10 - 10 * 0,1 - 100

- 4 - 1 - 1 - 100 = - 106

 

Answer 2

a)3(xdo kwadratu-2x+3)-2(xdo kwadratu-5x-1)  dlax=2

3(x²-2x+3)-2(x²-5x-1)=

3x²-6x+9-2x²-10x+2=b=

 

x²-16x+11=

2²-16*2+11=

4-32+11=-17

 

b)a(2ab+b)-b(a-2ab+a do kwadratu)    dla a=0,1 i b= -10

a(2ab+b)-b(a-2ab+a²)

2a²b+ab-ab+2ab²-a²b

a²b +2ab²

(0.1)²*(-10)+2(0.1*(-10)²)=

0.01*(-10)+2(0.1*100)=

-0.1+2(10)=-0.1+20=19.1