Question

determine the maximum or the minimum of

a)2x^2+12x

Answer 1

2x^2+10 maybe?

Answer 2

2x^2+12x
= 2(x^2 + 6x)
= 2(x^2 + 6x <b>+ 9 - 9</b>0)
= 2( (x+3)^2 - 9)
= 2(x+3)^2 - 18

Minimum value of -18 when x = -3