Question

ex3 de rezolvat ecuatile a,b,c varog frumos

Answer 1

a) x²+3x+5x+15=x²+7x-x-7+10
x²+8x-15=x²+6x+3
x²-x²+8x-6x=3+15
2x=18
x=18/2
x=9

b) x²-25=x²+3x+x+3+12
x²-25=x²+4x+15
x²-x²-4x=15+25
-4x=40
-x=40/4=10      inmultim -1
x=-10


c) x²-2x+1+x²+4x+4=x²+2x+1+x²-4x-4
2x²+2x+5=2x²-2x-3
2x²-2x²+2x+2x=-3-5
4x=-8
x=-8/4
x=-2