I think that the answer is 8
if you want to check if it is right input 8 in place of b
Answer:
y=-7x+9
Step-by-step explanation:
Given:
The equation is:

Find-:
Binomials factor of the equation
Explanation-:
The quadratic equation,

Solve for factor

Then the factor is:

So, the factor is x + 4
Sin=opposite side/hypotenuse
cos=adjacent side/hypotenuse
tan=sin/cos or opposite/adjacent