factorise 84-2x-2x²
Answers
Answered by
5
Answer:
divide the polynomial by -2
then it becomes
X ^2 + X -42
solve by splitting the middle term
x^2 +7x -6x-42
(X+7)(x-6)
Answered by
7
Answer:
-2x² - 2x -84
= -2x² -( 14-12)x - 84
= -2x² - 14x + 12x -84
= -2x (x + 7) +12 ( x - 7)
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