the sum of 2 digit number is 8 and multiplication is 15 find the no.
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Let the no be XY
X+ Y = 8
XY = 15
X= 15/Y
put in X+Y = 8
15/Y + Y= 8
15 + Y^2 - 8Y = 0
Y^2 -5Y -3Y +15=0
Y( Y-5) -3( Y-5)=0
Y= 3,5
X= 15/3, 15/5 = 5,3
So
no's are 53, 35
X+ Y = 8
XY = 15
X= 15/Y
put in X+Y = 8
15/Y + Y= 8
15 + Y^2 - 8Y = 0
Y^2 -5Y -3Y +15=0
Y( Y-5) -3( Y-5)=0
Y= 3,5
X= 15/3, 15/5 = 5,3
So
no's are 53, 35
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