a+b=-13 , ab=36 what are a and b
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a=9 b=4
If a=9 and b=4 then how will you get -13
Answered by
24
a+b = -13
a= -13 - b
ab= 36
a =36/b
36/b = - 13 - b
36 = (-13 - b)b
36 = - 13 b - b2
b2 + 13 b +36 =0
b2 + 9b + 4b +36 =0
b (b + 9) +4(b+9)=0
(b+9) (b+4) =0
b= -9 or b= -4
Let b= -9 then a = - 4
Let b= - 4 then a= - 9
a= -13 - b
ab= 36
a =36/b
36/b = - 13 - b
36 = (-13 - b)b
36 = - 13 b - b2
b2 + 13 b +36 =0
b2 + 9b + 4b +36 =0
b (b + 9) +4(b+9)=0
(b+9) (b+4) =0
b= -9 or b= -4
Let b= -9 then a = - 4
Let b= - 4 then a= - 9
9 n 4 as simple by substitution
correct answer
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