laylerzj laylerzj

03-08-2021
Mathematics

contestada

not sure how to solve this

not sure how to solve this class=

Respuesta :

Аноним Аноним

03-08-2021

Answer:

x=11

Step-by-step explanation:

(x+7)×7=6×(6+15)

or, 7x+49=6×21

or, 7x=126-49

or, 7x=77

or, x=11

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factorise :12(x²+7)²-8(x²+7)(2x-1)-15(2x-1)²