Question

Answer 1

a: \(=3x^2+4xy-2x\)

b: \(=\dfrac{\left(-15\right)^7\cdot x^{14}y^{21}}{15^6\cdot x^6y^{18}}-\dfrac{32x^{18}y^5}{16x^{10}y^2}\)

\(=-15x^8y^3-2x^8y^3=-17x^8y^3\)

c: \(=\dfrac{\left(x-5\right)^4-9\left(x-5\right)^3-2\left(x-5\right)}{\left(x-5\right)^2}\)

\(=\left(x-5\right)^2-9\left(x-5\right)-\dfrac{2}{x-5}\)

d: \(=\dfrac{\left(2x-1\right)\left(4x^2+2x+1\right)}{4x^2+2x+1}=2x-1\)

e: \(=\dfrac{x^4+4x^2-2x^3-8x}{x^2+4}=x^2-2x\)