Answer:

1. x = +√-4

x = -✓-4

2. x = +/- √101

Step-by-step explanation:

1. (x+4)(x-4) = 5(-4)

x^2 - 16 = -20

x^2 = -20 +16

x^2 = -4

x = +√-4

x = -✓-4

2. (x+9)(x-9) = 3(7)

x^2 - 81 = 21

x^2 = 21 + 81

x^2 = 101

x = +/- √101