Questions: 7+2x^2-4x^3

7+2x^2-4x^3
Transcript text: $7+2 x^{2}-4 x^{3}$
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Solution

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Solution Steps

Step 1: Substitute x x

Substituting x=2 x = 2 into the polynomial expression 7+2x2−4x3 7 + 2x^2 - 4x^3 : 7+2(2)2−4(2)3 7 + 2(2)^2 - 4(2)^3

Step 2: Calculate 2(2)2 2(2)^2

Calculating 2(2)2 2(2)^2 : 2(2)2=2⋅4=8 2(2)^2 = 2 \cdot 4 = 8

Step 3: Calculate −4(2)3 -4(2)^3

Calculating −4(2)3 -4(2)^3 : −4(2)3=−4⋅8=−32 -4(2)^3 = -4 \cdot 8 = -32

Step 4: Combine the Results

Combining all the results: 7+8−32=15−32=−17 7 + 8 - 32 = 15 - 32 = -17

Final Answer

−17\boxed{-17}

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