Question

If x²-x-42= (x+k)(x+6) then k is equal t
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Answer 1

Step-by-step explanation:

x2 – x – 42 = (x + k) (x + 6)

⇒ x2 – 7x + 6x – 42 = (x + k) (x + 6)

⇒x (x – 7) + 6 (x – 7) = (x + k) (x + 6)

⇒ (x – 7) (x + 6) = (x + k) (x + 6)

On comparison

k = – 7