3 (2x^2 - 5) -4x^2
Distribute 3 to both terms inside the parentheses
3 (2x^2) + 3 (-5) - 4x^2
6x^2 - 15 - 4x^2
Combine like terms:
6x^2 - 4x^2 -15
2 x^2 - 15
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