The phrase “three point charges are aligned along the x axis as shown in the figure below” is the setup of a standard electrostatics problem, but by itself it is incomplete: the actual numerical data (values of the charges, their exact positions, and what is being asked) are missing.

To give you a correct, worked solution, I need the rest of the problem statement, for example:

  • The value and sign of each charge (like −4.0textnC,+5.0textnC,+3.0textnC-4.0\\text{nC},+5.0\\text{nC},+3.0\\text{nC}−4.0textnC,+5.0textnC,+3.0textnC).
  • The positions on the x‑axis (e.g. one at x=0x=0x=0, one at x=0.50textmx=0.50\\text{m}x=0.50textm, one at x=0.80textmx=0.80\\text{m}x=0.80textm).
  • What you are supposed to find (electric field at a point, net force on one charge, position where field is zero, etc.).

Once you provide either:

  • the full text of the question, or
  • a quick description like: “q₁ = … C at x = … m, q₂ = … C at x = … m, q₃ = … C at x = … m, find …”

I can walk you step‑by‑step through:

  1. Drawing the x‑axis and placing each charge.
  2. Using Coulomb’s law F=k∣qiqj∣r2F=k\dfrac{|q_iq_j|}{r^2}F=kr2∣qi​qj​∣​ or E=k∣q∣r2E=k\dfrac{|q|}{r^2}E=kr2∣q∣​.
  3. Assigning directions (left/right) along the x‑axis and adding fields or forces with signs.
  4. Solving any equation for the unknown (field, force, or position).

Please paste the full problem (or type out the numbers and what’s asked), and I’ll solve it in detail.