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Sagot :

3X^2-8=13

3X^2=13+8

3X^2=21

X^2=21÷3

X^2=7

X=√7 Ou -√7

VINS

bonsoir

3 x² - 8 = 13

3 x²  - 8 - 13 = 0

3 x² - 21 = 0

3 ( x² - 7 ) = 0

x²  - 7 = 0

x² = 7

x = √7  ou - √7

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