Answer:
1. (x + 5)(x + 9) = 20
x² + 9x + 5x + 45 - 20 = 0
2. (2x - 1)(x + 3) = -2x
2x² + 3x - x - 3 + 2x = 0
3. (x + 6)² = 12x
(x + 6)(x + 6) = 12x
x² + 6x + 6x + 36 - 12x = 0
4. (5x + 4)(5x - 4) = 0
25x² -20x + 20x - 16 = 0
5. (3x - 8)(x + 2) = 2x²
3x² + 6x - 8x - 16 - 2x² = 0
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Answers & Comments
Answer:
1. (x + 5)(x + 9) = 20
x² + 9x + 5x + 45 - 20 = 0
x² + 14x + 25 = 0
2. (2x - 1)(x + 3) = -2x
2x² + 3x - x - 3 + 2x = 0
2x² + 4x - 3 = 0
3. (x + 6)² = 12x
(x + 6)(x + 6) = 12x
x² + 6x + 6x + 36 - 12x = 0
x² + 36 = 0
4. (5x + 4)(5x - 4) = 0
25x² -20x + 20x - 16 = 0
25x² - 16 = 0
5. (3x - 8)(x + 2) = 2x²
3x² + 6x - 8x - 16 - 2x² = 0
x² - 2x - 16 = 0