we can try n = 1 and see if -27 is the output
(1) 15 – 27(1)
(2) 15 – 27(1 – 1)
(3) – 27 + 15(1)
(4) – 27 +15(1 – 1)
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we can try n = 1 and see if -27 is the output
(1) 15 – 27(1)
(2) 15 – 27(1 – 1)
(3) – 27 + 15(1)
(4) – 27 +15(1 – 1)
Math Confidence by Robin the Math Lady 