values of x

Question

Select the approximate values of x that are solutions to f(x) = 0, where
f(x) = -4x2 + 3x + 7.

 

These are the answers I have to choose from
{1.75, –1.00}

{-4, 3}

{–0.75, –1.75}

{–0.57, 0.43}

 

Answer 1

-4x² + 3x + 7 = 0

-4 (x² - 3x -7) = 0

-4 (x + 1)(4x - 7) = 0

 

One zero is 7/4, or 1.75 and the other is -1.

 

Go with the first choice.