2. Ifp=-2, find the value of:
(1) 4p+ 7
(ii) - 3p2 + 4p + 7
(ii) - 2p3 - 3p2 + 4p + 7
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p = -2
(1) 4p+ 7
= 4 × (-2) + 7
= (-8) + 7 {(+) (-) = (-)}
Answer = (-56)
(2) 3p2 + 4p + 7
= 3 × (-2) × 2 + 4 × (-2) + 7
= (-6) × 2 + 4 × (-2) + 7
= (-12) + (-8) + 7
= (-20) + 7 = (-13)
Answer = (-13)
(3) 2p3 - 3p2 + 4p + 7
= 2 × (-2) × 3 - 3 × (-2) × 2 + 4 × (-2) + 7
= (-4) × 3 - 3 × (-2) × 2 + 4 × (-2) + 7
= (-12) - 3 × (-2) × 2 + 4 × (-2) + 7
= (-15) × (-2) × 2 + 4 × (-2) + 7
= 30 × 2 + 4 × (-2) + 7
= 60 + 4 × (-2) + 7
= 64 × (-2) + 7
= (-128) + 7 = (-121)
Answer = (-121)
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