Question

Rezolvati in R ecuatiea:x(x+2)-(x-3)(x+3)egal13;4x(x-1)-(2x+5)(2x+5)egal1;

Answer 1

rezolvare:
x la 2 +2x-x la 2 +9=13
2x+9=13
2x=13-9
2x=4
x=2

4x la 2 -4x-4x la 2 -20x-25=1
-24x-25=1
-24x=1+25
-24x=26
x=-26:24

Answer 2

x(x+2)-(x-3)(x+3)=13
x la puterea 2 +2x-x la puterea 2 +3 la puterea 2=13
2x+9=13
2x=13-9
2x=4
x=4:2
x=2

4x(x-1)-(2x+5)(2x+5)=1
4x la puterea 2-4x-4x la puterea 2 -10x-10x-25=1
-4x-20x-25=1
-24x-25=1
-24x=1+25
-24x=26
x=26/24
x=13/12
x=1,08(3)