Question

2. If p(x) = 5 - 4x + 2x2, find:
(i) P(2) (ii) p(- 2) (iii) p(4).​

Answer 1

$Given \: p(x) = 5 - 4x + 2x^{2}$

$i) Value \: of \: p(2) \\= 5 - 4 \times 2 + 2 \times 2^{2} \\= 5 - 8 + 8 \\= 5$

$ii) Value \: of \: p(-2) \\= 5 - 4 \times (-2) + 2 \times (-2)^{2} \\= 5 + 8 + 8 \\= 21$

$iii) Value \: of \: p(4) \\= 5 - 4 \times 4+ 2 \times 4^{2} \\= 5 - 16 + 32 \\= 21$

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