Question

va rog frumos urgent!!!!dau coroana .
ex 6. numai punctul b si d

Answer 1

a)
(x-3)²+7 = 2x+(x+4)²
x²-6x+9+7 = 2x+x²+8x+16
-6x+16 = 10x+16
-6x=10x 
x=0

b)
(x-3)²+2(x+5)(x-5)=3(x+1)²+4
x²-6x+9+2x²-50=3x²+6x+3+4
-6x+9-50=+6x+3+4
12x=-41-7
12x=-48
x=-4

c)1+x(x-1)=(x-2)²
1+x²-x=x²-4x+4
1-x=-4x+4
3x=3
x=1

d)
12-2(x-1)²=4(x-2)-(x-3)(2x-5)
12-2x²+4x-2=4x-8-2x²+6x+5x-15
10+4x=15x-23
11x=33
x=3