4. यदि m+n=5 और mn=6 हो तो (m2+n2) (m3+n3) = क्या होगा?
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see the attachment and follow
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m+n = 5
m = 5-n ------- (i)
n = 5-m ------- (ii)
m x n = 6
m = 6/n ------- (iii)
m x n = 6
n = 6/m ------- (iv)
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