-13/2,Step-by-step EXPLANATION:(m + n) ^2 = m square + n square + 2mn2 = 15 +2mn-13 = 2mnmn = -13/2(m-n) square = m square + n square -2mn(m- n) square = 15 - 2*-13/2= 15 + 13= 28(m - n ) = root 28 = 2 root 7Hope it helps you
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