An algebra problem by Zulqarnain Ansari

Algebra Level 1

The difference of two positive numbers is 6 and their product is 112. Find the sum of the numbers.


The answer is 22.

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2 solutions

Muhammad Erfan
Jul 21, 2015

other ways:

let the first number is A and the second number is B, so:

( A B ) 2 = A 2 + B 2 2 A B = 36 { \left( A-B \right) }^{ 2 }={ A }^{ 2 }+{ B }^{ 2 }-2AB=36

A 2 + B 2 = 36 + 2 A B = 260 { A }^{ 2 }+{ B }^{ 2 }=36+2AB=260

then

( A + B ) 2 = A 2 + B 2 + 2 A B = 260 + 224 = 484 { \left( A+B \right) }^{ 2 }={ A }^{ 2 }+{ B }^{ 2 }+2AB=260+224=484 A + B = 484 = 22 A+B=\sqrt { 484 } =\boxed{22}

so the anwer is 22

Zulqarnain Ansari
Jul 21, 2015

Let x be one number, then x + 6 since their product is 112, therefore x(x + 6) = 112 That is x^2 + 6x - 112 = 0 gives x =8 and x = 14

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