Factorise each by first looking for a common factor and then completing the square.
a. 2x^2 + 4x - 4
b. 4x^2 - 8x - 20
c. 5x^2 + 30x + 5
d. 3x^2 - 12x - 39
e. 5x^2 - 30x + 10
f. 6x^2 + 24x - 6
g. 3x^2 + 30x + 39
h. 2x^2 - 8x - 14
i. 6x^2 + 36x - 30

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints

sorry

step-by-step explanation:

sorry, but im pretty sure its a now that i look at it

the answer is d

step-by-step explanation:

you can also use mathway to get you answer + steps