Me in question b. i need you . don’t ignore

a)  (x - 4)^2 + 4

Step-by-step explanation:

a) x^2 - 8x + 20

= (x - 4)^2 - 16 + 20

= (x - 4)^2 + 4

b) Find the minimum value of  the function

The function is a parabola  and

because the coefficient of x^2 is positive it opens upwards and will have a minimum value

(x - 4)^2 + 4 is the vertex form of the equation  and the minimum Value  is at the coordinates of the vertex:-  at  ((4,4). - so the minimum value is the y coordinate which is 4. Therefore it is always positive.

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^