If x+y= 19 and x-y= 11, then what is the value of 2x2 + 2y2?
Solution
Correct Answer: Option C
x+y=19……..(i) x-y =11……..(ii) i+ii, 2x=30 or, x=15 by putting the value of x in (I ) y=4 so, 2(15)2+2(4)2=482
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