Question

Which expression is equivalent to 4a + 10? 4(a + 5) 2(2a + 8) 4(a + 8) 2(2a + 5)

Answer 1

one way is to just multply them out but the easier way is to undistribute to see the answer

so
remember distributive property
a(b+c)=ab+ac

4a+10 is obvously a product
the common factor is 2 so
4a+10=2(2a)+2(5)
undistribute 2
2(2a)+2(5)=2(2a+5)
reverse distribute

answer is last option

Answer 2

answer is d: 2(2a+5)