(x+9)(x‐2)
x² - 2x + 9x - 18
x² + 7x - 18
(x+4)(x+4)
x² + 4x + 4x + 16
x² + 8x + 16
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(x+9)(x‐2)
x² - 2x + 9x - 18
x² + 7x - 18
(x+4)(x+4)
x² + 4x + 4x + 16
x² + 8x + 16