Factorise (42-x-x^2) are
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Answered by
15
42-x-x^2
-x^2 -x +42
-x^2 -7x +6x +42
-x(x+7) +6(x+7)
(6-x) (x+7)
-x^2 -x +42
-x^2 -7x +6x +42
-x(x+7) +6(x+7)
(6-x) (x+7)
Answered by
16
⇒ 42 - x - x².
⇒ x² - x - 42.
⇒ x² - 7x + 6x - 42.
⇒ x(x - 7) +6(x - 7).
⇒ (x+6)( x-7).
⇒ x² - x - 42.
⇒ x² - 7x + 6x - 42.
⇒ x(x - 7) +6(x - 7).
⇒ (x+6)( x-7).
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