Rational Expressions (Edexcel A-Level Mathematics): Quizzes

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Rational Expressions
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What is a rational function?

p(x)q(x)\frac{p(x)}{q(x)} where p,qp,q are polynomials

When must division be done before finding partial fractions?

When numerator degree \geq denominator

What is 3x28x32x26x\frac{3x^2-8x-3}{2x^2-6x} simplified by factorizing and canceling?

3x+12x\frac{3x+1}{2x}

What is the partial fraction form of 7x1(x+2)(x3)\frac{7x-1}{(x+2)(x-3)}?

Ax+2+Bx3\frac{A}{x+2}+\frac{B}{x-3}

What form is used for 9x14(x+4)(x1)2\frac{9x-14}{(x+4)(x-1)^2} in partial fractions?

Ax+4+Bx1+C(x1)2\frac{A}{x+4}+\frac{B}{x-1}+\frac{C}{(x-1)^2}

In 7x1A(x3)+B(x+2)7x-1\equiv A(x-3)+B(x+2), what tactical value of xx easily finds BB?

x=3x=3

What is 3x+2+4x3\frac{3}{x+2}+\frac{4}{x-3} as a single fraction?

7x1(x+2)(x3)\frac{7x-1}{(x+2)(x-3)}

What do you multiply by to clear fractions in 2(x+1)(x+3)Ax+1+Bx+3\frac{2}{(x+1)(x+3)}\equiv\frac{A}{x+1}+\frac{B}{x+3}?

(x+1)(x+3)(x+1)(x+3)

In x2(x1)2(x2)Ax2+Bx1+C(x1)2\frac{x^2}{(x-1)^2(x-2)}\equiv\frac{A}{x-2}+\frac{B}{x-1}+\frac{C}{(x-1)^2}, what is AA when x=2x=2?

A=4A=4

What remains after dividing 9x2+20x103x2+5x2\frac{9x^2+20x-10}{3x^2+5x-2}?

Quotient 33, remainder 5x45x-4

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