Question

factor 90 + 81. write your answer in the form a(b + c) where a is the gcf of 90 and 81.

Explanation:

Step1: Find GCF of 90 and 81

Factors of 90: \(1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90\)
Factors of 81: \(1, 3, 9, 27, 81\)
GCF is 9.

Step2: Divide each term by GCF

\(90 \div 9 = 10\), \(81 \div 9 = 9\)

Step3: Factor using GCF

\(90 + 81 = 9(10 + 9)\)

Answer:

\(9(10 + 9)\)