Please help

Question

What is the approximate values of x that are solutions to f(x)=0 where f(x)=-5x^2+9x+5

Answer 1

0 = -5x² + 9x + 5

 

Use the quadratic formula:

 

x = (9/10) ± (1/10)*[9² - 4(5)(-5)]^1/2

 

x = (9/10) ± (1/10)*[181]^1/2

 

x ≅ (0.9) ± 1.345

 

x ≅ 2.245 and -0.445