1.

If a+b=7 and ab=17 find a^2-ab+b^2

Answer»

ANSWER:

-2

Step-by-step EXPLANATION:

a+b=7

by USING IDENTITY, (a+b)^2=7^2

a^2 +2ab+b^2=49

since ab=17, a^2+2*17+b^2=49

a^2+b^2=49-34

a^2+b^2=15

therefore, a^2-ab+b^2=15-17

= -2



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