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Answer:
[tex]\sf (4x +5)(x+3)[/tex]
explanation:
[tex]\sf 4x^2 + 17x + 15[/tex]
common term of 15 and 4 is 60: [ 12 * 5 ]
[tex]\sf 4x^2 +12x+5x+ 15[/tex]
break down and factorise
[tex]\sf 4x(x+3) +5(x+3)[/tex]
group them together
[tex]\sf (4x +5)(x+3)[/tex]