Which equation gives the sum of

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11

m∠a is 90°

m∠b is 40°

step-by-step explanation:

where is the question is there is a formula or is there not one