Mathematics
tuna
56

Find the least common multiple of x2 – 2x – 15 and x2 + 2x – 3. (x + 5)(x + 3)(x + 1) (x – 5)(x + 1)(x + 3) (x – 5)(x + 3)(x – 1) (x + 3)(x – 1)(x + 5) z varies inversely with the product of x and y. When x = 2 and y = 4, z = 0.5 What is the value of z when x = 4 and y = 9? 40 1/9 45/2 40/9

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(1) Answers
nikolak

x² - 2x - 15 ⇒ x² - 5x + 3x - 5 ⇒ (x + 3)(x - 5)   LCM: (x + 3) x² + 2x - 3  ⇒ x² + 3x - x - 3   ⇒ (x - 1)(x + 3) The value of z is 40.

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