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Yuliya22 [10]
3 years ago
10

The difference between two positive integers is 4. If the smaller is added to the square of the larger, the sum is 68. Find the

integers.
Mathematics
1 answer:
xxMikexx [17]3 years ago
4 0
<h3>Given</h3>

Two positive integers x and y

x - y = 4

x² + y = 68

<h3>Find</h3>

x and y

<h3>Solution</h3>

Add the two equations together.

... (x - y) + (x² + y) = (4) + (68)

... x² + x = 72

Rearrange to standard form and factor.

... x² + x - 72 = 0

... (x + 9)(x - 8) = 0

Use the zero product rule to find the solutions. That rule says the product is zero when one or more factors is zero.

... x + 9 = 0 ⇒ x = -9

... x - 8 = 0 ⇒ x = 8 . . . . . . the positive solution

Then we can find y from

... 8 - y = 4

... y = 4 . . . . . . . add y-4 to the equation

The two positive integers are 8 and 4.

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