Problem

Evaluate the polynomial expression 2x3−5x2+3x−7 for x=−2.

Answer

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Answer

Finally, perform the addition and subtraction from left to right: −16−20−6−7=−49

Steps

Step 1 ：First, substitute −2 for x in the expression, which gives: 2(−2)3−5(−2)2+3(−2)−7

Step 2 ：Then, simplify the exponents: −16−20−6−7

Step 3 ：Finally, perform the addition and subtraction from left to right: −16−20−6−7=−49

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