7. If (a + b) = 2 and (a - b)= 10, find the values of : (i) (a? + b) (ii) ab.
[Hint. (a + b)2 + (a - b)2 = 2 (a+ b2) and (a + b)2 – (a - b)2 = 4 ab.]
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2
Answer:
a+b=2. - 1
a-b=10. - 2
In 1
a=2-b. - 3
Put 3 in 2
2-b-b=10
-2b=10-2
b= - 4
a=2+4
a=6
ab=6×(-4)
=-24
Answered by
8
Step-by-step explanation:
The answer to first part can easily be figured out from hint.
a^2+ b^2 =52
ab = -24
Step by step solution is given above.
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