Question

Sendo k² + y² = 85 e ky =18 , calcule (k-y)² ?

Answer 1

Acompanhe:

$(k-y)^2=k^2+y^2-2ky\\ \\ (k-y)^2=85-2*18\\ \\ (k-y)^2=85-36=49$

Answer 2

(k - y) * (k - y)
k² - ky - ky + y²
k² + y² - 2ky
85 - 2*18
85 - 36
= 49