(7x^2-4xy+5y^2) + (2x^2-xy-y^2)

Can someone check my answer? you

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)