Drill • Solve for the roots. Show your solutions. use an intermediate pad. 1. x² =225 2. 8x² = 48 3. (x + 4)² = 144 4.4x² - 256
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Drill • Solve for the roots. Show your solutions. use an intermediate pad. 1. x² =225 2. 8x² = 48 3. (x + 4)² = 144 4.4x² - 256
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Answer:
1.) x² = 225
√x² = √225
root : x = 15
2.) 8x² = 48
8x²/8 = 48/8
x² = 6
√x² = √6
root : x = ±√6
3.) ( x + 4 )² = 144
x² + 8x + 16 = 144
x² + 8x + 16 - 144 = 0
x² + 8x - 128 = 0
( x + 16 ) ( x - 8 )
x + 16 = 0
x + 16 - 16 = 0 - 16
root : x = -16
x - 8 = 0
x - 8 + 8 = 0 + 8
root : x = 8