12^2-(х+7)^2-(5-x)(19+x)

Question

12^2-(х+7)^2-(5-x)(19+x)

Answer 1

12^2-(х+7)^2-(5-x)(19+x)=
144-(х²+14х+49)-(95-5х-19х-х²)=144-х²-14х-49-95+5х+19х+х²=10х

Comments

95+5х разве нет?

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95+5x-19x-x^2