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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
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Earn +20 ptsQ: 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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