What value of x satisfies the equation x + 5 = 4?

SAT Nonlinear equations in one variable and systems of equations in two variables Practice Question 3 (Easy)

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Question bank / Nonlinear equations in one variable and systems of equations in two variables

Math · Advanced MathEasy

What value of $x$ satisfies the equation $\sqrt{x + 5} = 4$ ?

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Answer: 11

Square both sides: $x + 5 = 16$ . Subtract 5: $x = 11$ . Check: $\sqrt{16} = 4$ .

Forgetting to square 4 gives $x + 5 = 4$ and the incorrect value $-1$ .

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