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Algebra expanding brackets

I don’t get what happened to the (λ-1) on the bottom left of page 1.How did they just cancel it like that.

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(edited 12 months ago)
Reply 1
At the bottom of page 1 they factorise the expression on the left hand side by taking the common factor (lambda-1) out of each term.
(edited 12 months ago)
Reply 2
Oh yeah.That makes more sense.

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