What is the factored form of the expression t^2-81 a. ( t + 9 ) ( t - 9 ) b. ( t + 81 ) ( t - 81 ) c. ( t + 9 )^2 d. ( t - 9 )^2 i believe it's a, but i'm not sure. .

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

5x+2x=49

7x=49

x=7. 35 apples