bellanaflaherty bellanaflaherty

23-01-2020
Mathematics

contestada

make a question similar to the one below:
for example:
Solve this quadratic equation: x^2 = 81

and then solve it and explain how you did it.

Respuesta :

ghanami ghanami

23-01-2020

Answer:

two solutions : 9 ; -9

Step-by-step explanation:

x²=81

means : x² - 81 =0 but 81 = 9²

use identity ; a² - b² = (a-b)(a+b)

x² -9² = 0 : (x-9)(x+9)=0

x-9=0 or x+9 = 0

x =9 or x = -9

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