please ans this ques. by using identities
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We know
X+y=✓[x-y]^2+4xy
=✓4^2+4×21
=✓16+84
=✓100
=10
Now,solve
2x=14,X=7
And y=3
So x^3=343
And y^3=27
X+y=✓[x-y]^2+4xy
=✓4^2+4×21
=✓16+84
=✓100
=10
Now,solve
2x=14,X=7
And y=3
So x^3=343
And y^3=27
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