Search topics

Search
1 of 8 0-day streak

Determine parameters in a polynomial identity

DIFFICULTYintrostandardchallengeexam
QUESTION TYPEMix of allChange
Expanded quadratic with two parametersExpanded cubic with two parametersNOWMix of allRecommended
Question 1 of 8

No calculator

For every real value of \(x\), the expressions below are equal

\[P(x)=-2x^3 + 7x^2 - 2x + 1\]
\[Q(x)=-2x^3 + px^2 - 2x - 5 + q\]

The required identity is \(P(x)=Q(x)\)

For a numerical check, evaluate the displayed expressions at \(x=0\)

(a)1 mark

Use the identity to recover each unknown parameter

Select the coefficient condition that uses the identity correctly

(b)2 marks

Solve the coefficient conditions and enter the values of \(p, q\)

(c)1 mark

Evaluate the displayed polynomial at \(x=0\) and enter \(P(0)\)