Question

Find the value of the following expression for a=-4.
a) a^2-9
b) 3a-5
c) a^3-a^2+a+1
d) a^3+1​

Answer 1

$1) \: \: a {}^{2} - 9 \\ = ( - 4) {}^{2} - 9 \\ = 16 - 9 \\ = 7$

$2) \: 3a - 5 \\ = 3 \times ( - 4) - 5 \\ = - 12 - 5 \\ = - 17$

$3) \: a {}^{3} - a {}^{2} + a + 1 \\ = ( - 4) {}^{3} - ( - 4) {}^{2} + ( - 4) + 1 \\ = - 64 + 16 - 4 + 1 \\ = - 51$

$4) \: a {}^{3} + 1 \\ = ( - 4) {}^{3} + 1 \\ = - 64 + 1 \\ = - 63$

Answer 2

Answer:

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