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= x² - x - 6
b. (4k +1) (4k+1) = 16k² + 4k + 4k + 1
= 16k² + 8k +1
= x² - x - 6
b. (4k + 1)² = (4k + 1) (4k+1)
= 16k² + 4k +4k +1
= 16k² +8k +1