Question

21
If 7 raise to the power x-y = 343 and 7 raise to the power x+y=2401
then x is equal to
a) 1/2
b)9/2
c)7/2
d)5/2
​

Answer 1

Answer:

An index number is a number which is raised to a power. ... x7/2 . √y3. a. x2/y2. b. x2 . y2. c. xy. d. x2/y. 3. If √(3 + ³√x) = 2, then x is ...

Answer 2

Answer:

using power and exponent

7^(x-y) =7^3

x-y=3

7^(x+y) =7^4

x+y =4

add two eq.

2x=7

x=7/2

ok

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