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6(2x² - 5) = [?]
x = -3


Sagot :

x = -3

[tex]6( {2x}^{2} - 5) \\ \\ 6(2 \times { (- 3)}^{2} - 5) \\ \\ 6(2 \times ( 9) - 5) \\ \\ 6( 18 - 5) \\ \\ 6 \times ( 13) \\ \\ 78.[/tex]

=6(2(-3)^2-5)
=6(2*9-5)
=6(18-5)
=6*13
=78