one
16 = 16 is an identity, not an equation. An identity does not have solutions.
x = 7
Only 1.
Infinitely many: they are the same line!
1 SOLUTION
2(x - 2)(x + 4) = 0 x = 2, -4
one
x2 + 6x = 16=> x2 + 6x - 16 = 0=> x2 + 8x -2x - 16 = 0=> (x+8)(x-2) = 0=> x = -8 or x = 2So, the solutions of the quadratic equation x2 + 6x = 16 are -8 and 2.
16 = 16 is an identity, not an equation. An identity does not have solutions.
4x2 - 30 = 34 ⇒ 4x2 = 64 ⇒ x2 = 16 ⇒ x = 4 or -4
The solutions to the quadratic equation are: x = -1 and x = 6
The two rational solutions are (0,0,0) and (1,1,1). There are no other real solutions.
x = 7
Only 1.
Infinitely many: they are the same line!
It has two solutions and they are: x = 3.230396696 and x = -2.063730029