I need help on these 2 questions. Algebra 1

7. is G

8. f(4)=-120

Step-by-step explanation:

7. les do f(0)=4 since its the easiest

F. f(0)=0.4(0+5)(0-2)

    0.4*-2*5=-4                NOT IT. the ans. is +

G. f(0)=-0.4(0+5)(0-2)

    -0.4*-2*5=4               YE

H. f(0)=-0.4(0-5)(0+2)

     -0.4*2*-5=4              YE

J. f(0)=0.4(0-5)(0+2)

     0.4*2*-5=-4              NOT I

so G n H

 Put both equation=0

G. 0=-0.4(x+5)(x-2)

    x=-5,2     YA this is the ans.

(1,4) is on graph of f(x)

f(1) = 4

so 1/4 f(x)

1/4 f(1)

1/4. ×4

1

so point for function 1/4. f(x) is (1,1)

f(x) = x^3 -2x^2 -3x

x( x^2 -2x-3)

x( x^2 +x -3x -3)

x( x(x+1) -3(x+1))

x( x-3)( x+1)

so zeroes are 0, 3,-1

its (2) option