if a+b =7 and ab=12 ,find the value of (a^2-ab+b^2).

Answers (1)

solution: we have ,

(a^2-ab+b^2)=(a^2+2ab+b^2-2ab-ab)

Rightarrow a^2-ab+b^2=(a+b)^2-3ab

Rightarrow a^2-ab+b^2=7^2-3	imes12=49-36=13

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