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Home > CAAC > Chapter 10 > Lesson 10.4.2 > Problem 10-139

10-139.

Use the quadratic formula.

Add 4 to both sides.

Solve for x.

x = −5

Complete the square.

Subtract 21 from both sides.

x2 − 10x = −25

Draw a generic rectangle.

You need 25 to complete the square.

Complete the rectangle.

Factor.

(x − 5)2 = −25 + 25

(x − 5)2 = 0

Solve for x.

x − 5 = 0

x = 5