If a+b = 10 and a-b = 6 then find the value of ab​

-0.641

-9.359

Explanation:

a+b = 10. Eq 1

ab = 6. Eq 2

From eq 1

a = 10 - b. Eq 3

From eq 3 on eq 2

(10-b) (b) = 6

10b - b^2 = 6

-b^2 + 10b - 6 = 0

b = (-10+-√{(10^2)-(4*-1-6)}) / (2*-1)

b = (-10 +-√{100-24)) / -2

b = (-10 +- √76) / -2

b = (10 +- 8.718)/-2

b1 = (10 - 8.718)/-2 = 1.282/-2 = -0.641

B2= (10 + 8.718)/2 = 18.718/-2 = -9.359

the answer is d

explanation:

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