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OlgaM077 [116]
2 years ago
13

Solve using the factoring method: x2 + 4x - 21 = 0

Mathematics
1 answer:
Lesechka [4]2 years ago
6 0

Answer:

x² + 4x - 21 = 0

x² + 7x - 3x - 21 = 0

x ( x + 7 ) -3 ( x + 7 ) = 0

( x - 3 ) ( x + 7 ) = 0

∴ x - 3 = 0              or              x + 7 = 0

  x = 0 + 3                               x = 0 - 7

 <u> x = 3 </u>                                      <u>x = -7</u>

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