if a+b=90 and ab=25 find a^2+b^2
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(a+b)^2=a^2+b^2+2ab
a^2+b^2=(a+b)^2-2ab
=90^2-2×25
=8100-50
=8050
hope it helps
a^2+b^2=(a+b)^2-2ab
=90^2-2×25
=8100-50
=8050
hope it helps
bindusri1828:
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