Question

Date
Page No.
s Find the coefficient of x² in (3x²-5) (4+4x²)
a) 12, b) 5, c) -8, d) 8
​

Answer 1

(3x

2

−5)(4+4x

2

)

(3 {x}^{2} \times 4) + (3 {x}^{2} \times 4 {x}^{2} ) + ( - 5 \times 4) + ( - 5 \times 4 {x}^{2} )(3x

2

×4)+(3x

2

×4x

2

)+(−5×4)+(−5×4x

2

)

\begin{gathered}12 {x}^{2} + 12 {x}^{4} - 20 - 20 {x}^{2} \\ \\ - 8 {x}^{2} + 12 {x}^{4} - 20\end{gathered}

12x

2

+12x

4

−20−20x

2

−8x

2

+12x

4

−20

Thus, the cofficient of x² is -8

Answer 2

Answer:

X+1/x=4 then value of x²+1/x³