The equation factors into: " (x + 4)(x –3) = 0 " .
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The solutions are: " x = - 4 " and " x = 3 " .
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Note:
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Factors of "-12" that, when added up", equal " +1 " ;
→ { Note: Refer to: "+1x" .}.
- 4, 3 : -4 + 3 = -1
4, -3 : 4 + (-3) = 4 -3 = 1 . Yes!
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So: " (x + 4)(x –3) = 0 " ; x = - 4, and x = 3 .
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