Answer:
[tex]12-20x^{2}[/tex]
Step-by-step explanation:
[tex]4(3-5x^{2}) = (4*3)-(4*5x^{2} )[/tex]
[tex]4*3 = 12[/tex]
[tex]4*5x^{2} =20x^{2}[/tex] since you only multiply the numbers
