Answer:
x=4
Step-by-step explanation:
(8^3)(8^x)=87
512(8^x)=2097152
512(8^x)/512 = 2097152/512
8^x=4096
log(8^x)=log(4096)
x*(log(8))=log(4096)
x= log(4096) / log(8)
8^3 ×8^x =8^7
3+x=7
x=7-3
8^3×8^4 =8^(3+4)=8^7
