Question

A) x2 -5x =84
B) x² = 121
c) x² - 8x=0
D) x²- 196=0
E) x² + 2x=15
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Answer 1

Hola !! ^^

A) x^2 - 5x - 84 =0

(x-12)(x+7) = 0

x1 = -7

x2 = 12

B) x^2 - 121 = 0

(x+11)(x-11)

x1 = - 11

x2 = 11

C) x^2 - 8x = 0

x (x-8) = 0

x1 = 0

x2 = 8

D) x^2 - 196 = 0

(x+14)(x-14) = 0

x1 = -14

x2 = 14

E) x^2 + 2x - 15 = 0

(x+5)(x-3) = 0

x1 = - 5

x2 = 3

Espero que te sirva !! ^^