If 5^5 × 5^7 = (5^4)^x , then what is the value of x?	Pick:
A) 2
B) 3
C) 4
D) 5
E) 6
5^5 × 5^7 = (5^4)^x   5^(5+7) = 5^(12) With multiplying numbers with exponents it's the same as adding the exponents   5^12 = (5^4)^x   since base is same, we can equate powers:   When raising an exponent to an exponent, it's the same as multiplying them, therefore:   12=4x   x=3   Ans. 3) 3
<result>B</result>
If 5^5 × 5^7 = (5^4)^x , then what is the value of x?