Best Answer

You don't need to use the quadratic formula because:-

5r2 = 80

Divide both sides by 5:

x2 = 16

Square root both sides:

r = 4

Q: How do you solve 5r squared equals 80 with the Quadratic Formula?

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The quadratic formula is used to solve the quadratic equation. Many equations in which the variable is squared can be written as a quadratic equation, and then solved with the quadratic formula.

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I suggest you use the quadratic formula. In this case, a = 1, b = 5, c = 3.

a2+30a+56=0 , solve for a Using the quadratic formula, you will find that: a=-2 , a=-28

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Solve using the quadratic formula

The quadratic formula is used to solve the quadratic equation. Many equations in which the variable is squared can be written as a quadratic equation, and then solved with the quadratic formula.

It can be solved by using the quadratic equation formula.

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You can't because it is not a quadratic equation.

Using the quadratic equation formula: x = 8.42 or x = -1.42

I suggest you use the quadratic formula, with a = 3, b = -2, c = 7.

It can't be solved because the discriminant of the given quadratic equation is less than zero meaning it has no real roots.

x2+x-15 = 0 Using the quadratic equation formula: x = 3.405124838 or x = -4.405124838

Use the quadratic formula, with a = 1, b = -10, c = 29.Use the quadratic formula, with a = 1, b = -10, c = 29.Use the quadratic formula, with a = 1, b = -10, c = 29.Use the quadratic formula, with a = 1, b = -10, c = 29.

Use the quadratic formula. x = -4.265564 or -0.234436

Quadratic equation formula