1.

7-4y = 9, xy = 3 and Value of Gxt​

Answer»

ANSWER:

(7x-4y)=9

squaring both sides

49x²+16y²-56xy=81

add and SUBTRACT 56xy

49x²+16y²+56xy-112xy=81

(7x+4y)²=81+112xy

(7x+4y)²=81+336

(7x+4y)²=417



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