Question:medium

The sum of all possible values of \(x\) satisfying the equation \(2^{4x^2} - 2^{2x^2+x+16} + 2^{2x+30} = 0\), is

Updated On: Jan 13, 2026
  • \(\frac{5}{2}\)
  • \(\frac{1}{2}\)
  • 3
  • \(\frac{3}{2}\)
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The Correct Option is B

Solution and Explanation

Given Equation:
\(2^{4x^2} - 2^{2x^2+x+16} + 2^{2x+30} = 0\)

Rewrite the equation by decomposing the exponential terms:

\(\Rightarrow (2^{2x^2})^2 - 2^{2x^2} \cdot 2^{x+15} \cdot 2^1 + (2^{x+15})^2 = 0\)

This simplifies to:

\(\Rightarrow (2^{2x^2} - 2^{x+15})^2 = 0\)

Which means:

\(\Rightarrow 2^{2x^2} - 2^{x+15} = 0\)

Since the equation involves powers of the same base (2), we can equate the exponents:

\(\Rightarrow 2^{2x^2} = 2^{x+15}\)

Equating the exponents yields:

\(\Rightarrow 2x^2 = x + 15\)

Rearrange into standard quadratic form:

\(\Rightarrow 2x^2 - x - 15 = 0\)

Solve the quadratic equation by factoring:

\(\Rightarrow (2x + 5)(x - 3) = 0\)

The possible values for \(x\) are:

\(\Rightarrow x = -\frac{5}{2} \text{ or } x = 3\)

The sum of these possible values is:

\(-\frac{5}{2} + 3 = \frac{1}{2}\)

Thus, the correct answer is (B): \(\frac{1}{2}\)

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