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D. Solve each of the following quadratic equations by factoring.
1. 4x2 + 7x = 0
2. 81 - 4x2 = 0
3. x2 + 4x = 21

Sagot :

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Answer:

1. x(4x+7)

2. (2x+9)(-2x+9)

3. (x-3)(x+7)

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