Question

SOMEONE PLEASE HELP....

Answer 1

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!