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They want you solve the equation
- 49 = 0.
It is VERY SIMPLE.
First, move 49 from the left side of the equation to the right side, changing the sign. You will get
= 49.
Next step, take square root of both sides. Square root of 49 is +/- 7, so you will get
V + 4 = +/- 7.
Last step is to move "4" from the left side to the right side, changing its sign. You will get
V = - 4 +/- 7.
Thus, you have two solutions = - 4 + 7 = 3 and = -4 - 7 = -11. ANSWER
You may check the answer on your own by substituting the found values into the original equation.
The given equation was very simple - therefore, the solution is simple, too.