Question

If (a-b)=5,ab=84 then find (a+b)​

Answer 1

Answer:

(a - b) = 5

a = (b + 5) ---------(1)

ab = 84-------------(2)

put equation (1) in equation (2)

b(b + 5 ) = 84

b² + 5b - 84 = 0

b² + 12b - 7b - 84 = 0

b(b + 12) - 7(b + 12) = 0

(b + 12)(b - 7) = 0

b = -12 and 7

so, a = b + 5 => -7 and 12

hence,

(a , b ) = (-7, -12) or, (7, 12)

Step-by-step explanation:

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