Find the Discriminant -7x^2+8x+2

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Algebra

$- 7 x^{2} + 8 x + 2$

The discriminant of a quadratic is the expression inside the radical of the quadratic formula.

$b^{2} - 4 (a c)$

Substitute in the values of $a$ , $b$ , and $c$ .

$8^{2} - 4 (- 7 \cdot 2)$

Evaluate the result to find the discriminant.

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Simplify each term.

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Raise $8$ to the power of $2$ .

$64 - 4 (- 7 \cdot 2)$

Multiply $- 7$ by $2$ .

$64 - 4 \cdot - 14$

Multiply $- 4$ by $- 14$ .

$64 + 56$

Add $64$ and $56$ .

$120$

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Name

Name	eighty-eight million nine hundred sixteen thousand two hundred seventy-nine

Interesting facts

88916279 has 4 divisors, whose sum is 89074776
The reverse of 88916279 is 97261988
Previous prime number is 563

Basic properties

Is Prime? no
Number parity odd
Number length 8
Sum of Digits 50
Digital Root 5

Name

Name	one billion two hundred three million two hundred sixteen thousand seven hundred twenty-nine

Interesting facts

1203216729 has 16 divisors, whose sum is 1348513920
The reverse of 1203216729 is 9276123021
Previous prime number is 701

Basic properties

Is Prime? no
Number parity odd
Number length 10
Sum of Digits 33
Digital Root 6

Name

Name	one billion two hundred forty-eight million nine hundred fifty-three thousand six hundred fifteen

Interesting facts

1248953615 has 8 divisors, whose sum is 1449335712
The reverse of 1248953615 is 5163598421
Previous prime number is 7

Basic properties

Is Prime? no
Number parity odd
Number length 10
Sum of Digits 44
Digital Root 8

Factor 2x-4

Expand using the Binomial Theorem (x-y)^2

Solve by Factoring 2x^2+9x-5=0

Convert to Radical Form x^(4/3)

Factor x^2+4x-21