Answers

2016-07-10T22:20:45+08:00
Example: x² + 4x = 5 x² + 4x + 4 = 5 + 4 (In ax² + bx + c = 0... "4" is from... Half the "b" then squared) x² + 4x + 4 = 9 Factor then... (x + 2)² = 9 Take out the square and square root the "9" x + 2 = √9 x + 2 = ±3 x + 2 = 3 ; x + 2 = -3 x = 3 - 2 x = -3 - 2 xSUB1 = 1 ; xSUB2 = -5
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