(4x-49y/2√x-7√y)-5√y , если √x+√y=2

Question

(4x-49y/2√x-7√y)-5√y , если √x+√y=2

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Answer 1

(2Vx-7Vy)(2Vx+7Vy)/(2Vx-7Vy)-5Vy=
2Vx+7Vy-5Vy=
2Vx+2Vy=
2*(Vx+Vy)=2*2=4