6. a-b = 3 and ab = 10, Find a2 - b2
1) 7 2) 21
3) 30
4) 49
Answers
Answered by
1
Answer:
21
Step-by-step explanation:
a-b=3
(a-b)^2=9
a^2+b^2-2ab=9
a^+b^2-2ab+4ab=9+4ab
a^2+b^2+2ab=9+40
(a+b)^2=49
a+b=7
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