IOS is better because better camera
x2 +3x-40= x2+8x-5x-40=x(x+8)-5(x+8)=. (x+8) (x-5).
It is true because a rational function is defined as those functions where the variable is placed in the denominator, which must be restricted, because all denominators cannot be equal to zero, other wise it would be undetermined
Y = mx + b, m = 0. The equation becomes y = b, where b is the y-coordinate of the y-intercept.
