QuestionAugust 24, 2025

1. Find the value of f(-3) when f(x)=4x^2-2x+5

1. Find the value of f(-3) when f(x)=4x^2-2x+5
1. Find the value of f(-3) when f(x)=4x^2-2x+5

Solution
4.1(340 votes)

Answer

47 Explanation 1. Substitute x = -3 into the function Replace x with -3 in the expression f(x) = 4x^2 - 2x + 5. 2. Calculate 4(-3)^2 Compute 4 \times (-3)^2 = 4 \times 9 = 36. 3. Calculate -2(-3) Compute -2 \times (-3) = 6. 4. Add the results Sum up 36 + 6 + 5 = 47.

Explanation

1. Substitute $x = -3$ into the function<br /> Replace $x$ with $-3$ in the expression $f(x) = 4x^2 - 2x + 5$.<br /><br />2. Calculate $4(-3)^2$<br /> Compute $4 \times (-3)^2 = 4 \times 9 = 36$.<br /><br />3. Calculate $-2(-3)$<br /> Compute $-2 \times (-3) = 6$.<br /><br />4. Add the results<br /> Sum up $36 + 6 + 5 = 47$.
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