Questions from HW???. 2.13 Use Square Roots to Solve Quadratic Equations 2.10-2.13 Test: FRIDAY!!!!

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Presentation transcript:

Questions from HW???

2.13 Use Square Roots to Solve Quadratic Equations Test: FRIDAY!!!!

Vocabulary  If b 2 = a then b is a square root of a.  All positive real numbers have two square roots A positive square root (or principle square root) and a negative square root. This is written as

Vocabulary  A square root is written with the radical symbol  The number or expression inside the radical symbol is the radicand.

Vocabulary  The square of an integer is called a perfect square.

Example 1:  Solve the equation: x 2 – 7 = 9 z = 5

Example 2:  Solve 9m 2 = 169

Example 3:  Solve 2x = 15

Example 4:  Solve 3(x + 3) 2 = 39

You Try:  w 2 – 9 = 0  4r 2 – 7 = 9  2(y + 4) 2 = 18

Classwork:  P. 121 #2-24 EVENS