Question

prosze o rozwiazanie zadania !

To jest na jutro ,a matematyczka wstawi mi banię jak nie zrobie !

a) (3x-1)²-5(2x+1)²+(6x-3)(2x+1)=(x-1)²

b) 5(x-1)²-2(x+3)²=3(x+2)²-7(6x-1)

c) 2x²+(x+5)²-2(x-7)²=2(3x-72,5)+(x-6)²

Daje najjjj!!!!!

Answer 1

(3x-1)²-5(2x+1)²+(6x-3)(2x+1)=(x-1)²

9x²-6x+1-5(4x²+4x+1)+12x²+6x-6-3=x²-2x+1

9x²-20x²+12x²-x²-6x-20x+6x+2x=-1+5+6+3+1

-18x=14 /: (-18)

x=-¹⁴/₁₈

x=-⁷/₉

 

5(x-1)²-2(x+3)²=3(x+2)²-7(6x-1)

5(x²-2x+1)-2(x²+6x+9)=3(x²+4x+4)-42x+7

5x²-10x+5-2x²-12x-18=3x²+12x+12-42x+7

5x²-2x²-3x²-10x-12x-12x+42x=7+12+18-5

8x=32 /:8

x=4

 

2x²+(x+5)²-2(x-7)²=2(3x-72,5)+(x-6)²

2x²+x²+10x+25-2(x²-14x+49)=6x-145+x²-12x+36

2x²+x²+10x+25-2x²+28x-98=6x-145+x²-12x+36

2x²+x²-2x²-x²+10x+28x-6x+12x=36-145+98-25

44x=-36 /: 44

x=-³⁶/₄₄

x=-⁹/₁₁