Select the approximate values of x that are solutions to f(x) = 0,

Question

1)

where f(x) = -2x^2 + 8x + 3.? 

 

Update : A. {4.35, –0.35} 

B. {-2, 8} 

C. {–4.00, –1.50} 

D. {–0.67, 2.67} 
Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -9x^2 + 9x + 5 

A. {–1.80, 1.80} 

B. {-9, 9} 

C. {–1.00, –0.56} 

D. {–0.40, 1.40}

 

Answer 1

(1)

Given equation is 

Multiply each side by negative one.

Compare above equation with

then a=2 , b=-8 , c=-3

Formula for solution

So solution is option (A)

Answer 2

(2)

Multiply each side by negative one.

Compare above equation with

then a=2 , b=-8 , c=-3

Formula for solution

 

So solution is option (D)