adding -7 to 7, since they are both constants (no variable) gives you 0. Adding -5x and 5x since they both have an x term gives you 0x also written as 0 (0*any number is 0). this gives you a final answer of 0
Hello : f'(7) = the slope of the tangent line : let A(7,4) B(0,3)<span> <span>the slope is : (YB - YA)/(XB -XA)= (3-4)/(0-7) = -1/-7 = 1/7=f'(7) the equation of the tangent line is : y-3 = 1/7 (x-0) y = (1/7)x+3 the line tangent and the graph of : f </span></span><span>passes through the point A(7, 4) x= 7 y=4 so : f(7) =4</span>
