What is the vertex of 2x² plus 20x plus 7?

Answer 1

y=2x^2+20x+7

y=ax^2+bx+c

a=2; b=20; c=7

x-coordinate of the vertex is : -b/2a = -20/2(2) = -20/4 = -5

y-coordinate of the vertex = 2(-5)^2+20(-5)+7

= 2(25)-100+7

=50-100+7 = -43

The vertex is(-5,-43)