factorise the following 84-2r-2r²
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Adarshthakur11:
then how will u equate (r+7) (r-6)???
this factorise
did u study in 9 class ch-2
ex 2.5
in which class do u study??
ninth
do you know him
so miss tell me is my answer right or wrong??
i am in 10 class
i remember in 9 class
Answered by
173
Answer:
84-2r-2r² = 2(6-r)(7+r)
Explanation:
Given quadratic expression in variable r is
84-2r-2r²
= 2(42-r-r²) /* Taking 2 common */
= 2( 42 - 7r + 6r - r²) /* splitting the middle term */
= 2[7(6-r)+r(6-r)]
= 2(6-r)(7+r)
Therefore,.
2, (6-r) and (7+r) are factors of given quadratic expression.
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