Choose the constant term that completes the perfect square trinomial.

y 2 - 7y

-49/2
+49/2
+49/4

ANSWER

+49/4

EXPLANATION

The given expression is

For this to be a perfect square we must add the square of half the coefficient of y.

The correct choice is the third option.

+49/4

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6