Answer:
vertex = (
, -
)
Explanation:
Given a quadratic equation in standard form
ax² + bx + c = 0 ( a ≠ 0 )
Then the x- coordinate of the vertex is
= -

7n² - 40n + 25 = 0 ← is in standard form
with a = 7, b= - 40 , thus
= -
=

Substitute this value into the equation for corresponding y- coordinate
7(
)² - 40(
) + 25
= 7(
) -
+ 25
=
-
+ 25
= -
+
= -

vertex = (
, -
)