What is maximum optimal temperature for wheat crop?

I. x² + 25x + 154 = 0

II. y² + 27y + 181 = 0

I. 4x² -  15x + 9 = 0

II. 20y² -  23y + 6 = 0

If the roots of the quadratic equation 7y² + 5y + 9 = 0 are α and β, then find the value of [(1/α) + (1/β)].

I. 4x² - 21 x + 20 = 0

II. 8y² - 22 y + 15 = 0

I. 12 x ² - 3 x – 15 = 0

II. 2 y² + 12

I. 6p² + 17p + 12 = 0

II. 12q² - 25q + 7 = 0

I. x² + x – 42 = 0

II. y² + 6y – 27 = 0

I. 22x² - 97x + 105 = 0

II. 35y² - 61y + 24 = 0

I. 10x² + 33x + 9 = 0

II. 2y² + 13y + 21 = 0

If α, β are the roots of the equation x² – px + q = 0, then the value of α²+β²+2αβ is