Step-by-step explanation:
f(x)=7(x^2+3x-10)=7(x+2)(x-5)
set each factor equal to 0
4x-3 = 0
2x-1 = 0
solve for x.
4x-3=0
4x=3
x= 3/4
2x-1= 0
2x= 1
x= 1/2
eventually after a few more steps, your answer should be 1/2 is less than or equal to x and 3/4 is greater than or equal to x