a2-10a+36=0

Question

a²-10a+36=0

Answer 1

a² -10a + 36 = 0

a² - 10a = -36

(a - 5)² = -36 + 25

√((a - 5)² ) = √(-11)

a - 5 = √(-11)

a = 5 ± √-11

since you're taking the square root of a negative number, we introduce ¡² = -1

a = 5 ± √( -1 * 11)

replace -1 by ¡²

a = 5 ± √( ¡² * 11)

a = 5 ± ¡√11