Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -7x2 + 5x + 7.

pleaase help with this
in Algebra 1 Answers by Level 1 User (580 points)

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1 Answer

-7x^2 + 5x + 7 = 0

x = (-5 +- sqrt(25-4*-7*7))/2(-7)

x = (-5 +- sqrt(25+196))/-14

x = (-5 +- sqrt(221))/-14

The square root of 225 is 15, and we're approximating so. . .

x = (-5 +- 15)/-14

x = -20/-14, 10/-14

x = 10/7, -5/7
by Level 13 User (103k points)

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