42 - (-25) = 42 + 27 = 69
33 - (-77) = 33 + 77 = 110
44 + (-18) = 44 - 18 = 26
From the function y=x^2-4x+7
to complete the square we proceed as follows:
The vertex form is given by:
y=(x-h)^2+k
where (h,k) is the vertex:
thus from the function we shall have:
y=x^2-4x+7
c=(b/2a)²
c=(4/2)²=4
thus adding an subtracting 4 in the expression:
y=x^2-4x+4-4+7
y=(x-2)^2+3
thus the vertex will be:
(2,3)
The answer is:
<span>D. Minimum at (2, 3)</span>
IM going to assume that the "2" is to be squared. If so, then the answer is 2(15x^2+8)