Indices, Logarithms and Surds - Jamb Mathematics Past Questions and Answers

Question 31:

• JAMB 2015

Find the value of x if \( [ 1 ÷ 64^{(x + 2)}]= [4^{(x − 3)} ÷ 16^x ] \)

A. \( \frac{3}{2} \)
B. \( \frac{2}{3} \)
C. \( \frac{1}{3} \)
D. \( -\frac{3}{2} \)

Question 32:

• JAMB 2015

Evaluate log₇17

A. 1.35
B. 1.353
C. 1.455
D. 0.455

Question 33:

• JAMB 2015

Evaluate log5(\( y^2x^5 ÷ 125b½) \)

A. 2 log₅y + 5log₅ y² − 3
B. Log₅ y² + 5log₅ x + 3
C. 25log_y 5 + 3
D. 2log₅y + 5log₅x − ½ log₅b −3

Question 34:

• JAMB 2015

Simplify √30 x √40

A. 10 √3
B. 5 √3
C. 20 √3
D. 15 √3

Question 35:

• JAMB 2015

Solve the equation
\( 5^{(x − 2)} = (1 ÷ 125)^{(x +3)}\)

A. 3/2
B. − 7/4
C. 4/7
D. 7/4