Question

(d) (8x2 + 7y2 – z2 + 2yz + 3xz – 5xy) * (2x – 3y) vertical method
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Answer 1

(8x²+7y²–z²+2yz+3xz–5xy) × ( 2x–3y)

= (16x³+14xy²–2z²x+4yzx+6x²z–10x²y –24yx²–21y³+3z²y–6y²z–9xzy+15xy²)

=( 16x³+29xy²–2z²x–5xyz+6x²z–34x²y–21y³+3z²y–6y²z)

`= 16 {x}^(3) - 21 {y}^(3) - 2 {z}^(2)x + 3 {z}^(2) y - 5xyz - 6 {y}^(2) z + 6 {x}^(2) z - 34 {x}^(2) y+ 29x {y}^(2)`

I hope I helped you^_^