Answer:
--- equation
--- the equation is true for these values
--- the equation is extraneous for these values
Explanation:
Given


Solving (a): Equation to solve for a, b and c, using trial by error where

We have:

Substitute 7 for x
--- This is the equation
Solving (b): Solve for a, b and c --- to make the equation true

Let a = 3 ----- Here, we choose a value for a


Square both sides

Let b = 5 --------- Here, we choose a value for b


Subtract 35 from both sides

So,
is true for

Solving (b): Solve for a, b and c --- to make the equation false

Substitute

So, we have:


Square both sides
--- This is false
i.e.
