JAMB - Mathematics (2015 - No. 16)
If log520 = x, find x
1.761
1.354
1.861
2.549
คำอธิบาย
log520 = x
5x = 20(Take log10 of both sides)
log5x = log20
xlog5 = log20
x= [log20 ÷ log5]
[1.30103 ÷ 0.69897]
x = 1.861
5x = 20(Take log10 of both sides)
log5x = log20
xlog5 = log20
x= [log20 ÷ log5]
[1.30103 ÷ 0.69897]
x = 1.861