Select the appropriate values of x that are solutions to f (x)=0, where f ( x ) =-7x^2+4x+9
(-0.78,0.44)
(-7,4)
(-0.57,-1.29)
(-0.88,1.46)
Select the appropriate values of x that are solutions to f ( x ) =-5x^2+8x+5
(2.08,-0.48)
(-5,8)
(-1.60,-1.00)
(-1.00,1.60)
-7x^2 + 4x + 9 = 0
7x^2 - 4x - 9 = 0
using the formula ...
x = (4 ± √268)/14
= appr 1.455 or x = - .884
the only one that comes close is the last choice
Do the other one in the same way