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12-45.
  1. Solve each equation. Check for extraneous solutions. Homework Help ✎

    1. = x + 1

Square both sides of the equation to remove the radical.

x + 7 = x2 + 2x + 1

Set the equation equal to 0 because it is quadratic (there is an x2-term.)

0 = x2 + x − 6

Factor the polynomial.

Use the Zero Product Property to solve.

Check your solutions in the original equation. Do they both work?

Notice that you can factor x2 + 3x to x(x + 3).

Multiply both sides of the equation by a common denominator to remove the fractions.

2x − (x + 3) = −6

Solve for x.

x = −3

Substitute your solution back into the original equation. Is x = −3 a valid solution to this problem?