Consider the form <math><mstyle displaystyle="true"><msup><mrow><mi>x</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>+</mo><mi>b</mi><mi>x</mi><mo>+</mo><mi>c</mi></mstyle></math> . Find a pair of integers whose product is <math><mstyle displaystyle="true"><mi>c</mi></mstyle></math> and whose sum is <math><mstyle displaystyle="true"><mi>b</mi></mstyle></math> . In this case, whose product is <math><mstyle displaystyle="true"><mo>-</mo><mn>28</mn></mstyle></math> and whose sum is <math><mstyle displaystyle="true"><mn>3</mn></mstyle></math> .

Write the factored form using these integers.

If any individual factor on the left side of the equation is equal to <math><mstyle displaystyle="true"><mn>0</mn></mstyle></math> , the entire expression will be equal to <math><mstyle displaystyle="true"><mn>0</mn></mstyle></math> .

Set the first factor equal to <math><mstyle displaystyle="true"><mn>0</mn></mstyle></math> .

Add <math><mstyle displaystyle="true"><mn>4</mn></mstyle></math> to both sides of the equation.

Set the next factor equal to <math><mstyle displaystyle="true"><mn>0</mn></mstyle></math> .

Subtract <math><mstyle displaystyle="true"><mn>7</mn></mstyle></math> from both sides of the equation.

The final solution is all the values that make <math><mstyle displaystyle="true"><mrow><mo>(</mo><mi>x</mi><mo>-</mo><mn>4</mn><mo>)</mo></mrow><mrow><mo>(</mo><mi>x</mi><mo>+</mo><mn>7</mn><mo>)</mo></mrow><mo>=</mo><mn>0</mn></mstyle></math> true.

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Name | one hundred ninety-eight million six hundred sixty-one thousand five hundred twenty |
---|

- 198661520 has 128 divisors, whose sum is
**1214632584** - The reverse of 198661520 is
**025166891** - Previous prime number is
**15817**

- Is Prime? no
- Number parity even
- Number length 9
- Sum of Digits 38
- Digital Root 2

Name | one billion nine hundred twenty-five million eight hundred eight thousand seven hundred ninety-six |
---|

- 1925808796 has 16 divisors, whose sum is
**4404104280** - The reverse of 1925808796 is
**6978085291** - Previous prime number is
**61**

- Is Prime? no
- Number parity even
- Number length 10
- Sum of Digits 55
- Digital Root 1

Name | one billion one hundred fourteen million three hundred four thousand ninety-four |
---|

- 1114304094 has 8 divisors, whose sum is
**1733362008** - The reverse of 1114304094 is
**4904034111** - Previous prime number is
**27**

- Is Prime? no
- Number parity even
- Number length 10
- Sum of Digits 27
- Digital Root 9