Question

Rozwiaż rownanie i sprawdz poprawnosc rozwiazania.

(3x+2)^2=3(3x^2-7)+1

Answer 1

( 3 x + 2)^2 = 3*( 3 x^2 - 7 ) + 1

9 x^2 + 12 x + 4 = 9 x^2 - 21 + 1

12 x = - 20 - 4

12 x = -24 / : 12

x = - 2

==================

spr.

[ 3*(-2) + 2]^2 = 3* [3 *(-2)^2 - 7 ] + 1

[ - 6 + 2]^2 = 3*[12 - 7] + 1

( - 4)^2 = 3*5 + 1

16  =  16

=============