"How do you evaluate −a(a2+2a−1) for a=2?" was answered by our experts

dojilaew1

Answered question

2022-02-04

How do you evaluate

- a (a^{2} + 2 a - 1)

for

a = 2

Ann Cole

Beginner2022-02-05Added 7 answers

Step 1
In substitution, we replace something for something else, in this case anytime we see a, we put a 2 there. Applying this:

- 2 (2^{2} + 2 (2) - 1)

= - 2 (4 + 4 - 1)

= - 2 (7)

= - 14

Ashly Forbes

Beginner2022-02-06Added 12 answers

Step 1

- a (a^{2} + 2 a - 1)

for

a = 2

Now substitute the value of a into the equation

\to \underset{⏟}{- a} (\underset{⏟}{a^{2}} + 2 \underset{⏟}{a} - 1)

\to - 2 (2^{2} + 2 (2) - 1)

\to - 2 (4 + 4 - 1)

\to - 2 (7)

\Rightarrow - 14

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