Question

Evaluate the exponential expression $x^5\times x^4$, for $x=2$

• A. 32
• B. 128
• C. 256
• D. 512

Answer 1

The correct option is D

512

$\text{Given expression is}{x}^5\times x^4$
Substituting 2 in place of x
$=2^5\times 2^4$

$\because a^m\times a^n=a^{(m+n)}$

$=2^{(5+4)}$
$=2^9=512$