Math, asked by snehagoyal, 1 year ago

factorise the following 84-2r-2r²

Answers

Answered by Adarshthakur11

152

hope it helps you........

Attachments:

Adarshthakur11: then how will u equate (r+7) (r-6)???

tabish1500p7pzip: this factorise

tabish1500p7pzip: did u study in 9 class ch-2

tabish1500p7pzip: ex 2.5

Adarshthakur11: in which class do u study??

snehagoyal: ninth

Adarshthakur11: do you know him

Adarshthakur11: so miss tell me is my answer right or wrong??

tabish1500p7pzip: i am in 10 class

tabish1500p7pzip: i remember in 9 class

Answered by mysticd

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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