If m:n = 13:11, find m2 - n2 : (m + n)2
If m:n = 13:11, find m2 - n2 : (m + n)2
1:11
1:13
1:10
1:12
Correct answer is D
m : n = 13 : 11
m2 - n2 : (m + n)2
= 132 - 112 : (13 + 11)2
= 169 - 121 : 242
= 48 : 576
= 1 : 12
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