18. Rezolvati ecuatiile: a) (x + 3)(x - 3) + 5(2x - 1) = (x + 3)(x - 2) + 5x - 10;
b) (x - 1)(x + 1) + (x+3)(x-3) = (x + 1)(x + 3) + (x - 2)"; c) (x - 2)(- 1) - 2(3x - 1) =
(x-3): d) 10-2(x - 1) = 3(x-1)-(1-2)(2x + 1); e) 4(x - 1)? + 3(x + 2)
= 7x - 1)' - 2(4- x); 1) 4x - (5x + 1) = 6(2x - 3) -7 -3; g) (2x - 3)(2x + 3) +
+ (x - 1) = 5(x + 2) - 3x + 1; h) (3x - 1)2 + (4x + 3)2 = (5x - 2).
(nota 9)
Indicație: Utilizați identitățile: (a + b)? = a + 2ab + b, (a - b) = 0 - 2ab + b sau
(a - b)(a + b)-a-b, oricare ar fi a,be R.​