SOMEONE PLEASE HELP....

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11 votes

Answer:

Explanation:

$(3x+4)(x^2+px+5) \\=3x^3+3px^2+15x+4x^2+4px+20\\=3x^3+(3p+4)x^2+(15+4p)x +20$

since we know that
x^2 in this expansion is
-23x^(2)

thus
$3p+4=-23\\3p=-27\\p=-9$

Hope that helps!

Argyle answered Sep 9, 2023

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