4(x+3)+3(2x-5)
question on a test paper
4(x + 3) + 3(2x - 5)
4x + 12 + 6x - 15
10x - 3
It's easy to verify. Choose any value for x
and work through the steps.
x = 5
4(x + 3) + 3(2x - 5) = 10x - 3
4(5 + 3) + 3(2(5) - 5) = 10(5) - 3
4(8) + 3(10 - 5)= 50 - 3
32 + 3(5) = 47
32 + 15 = 47
47 = 47
x = 18
4(x + 3) + 3(2x - 5) = 10x - 3
4(18 + 3) + 3(2(18) - 5) = 10(18) - 3
4(21) + 3(36 - 5) = 180 - 3
84 + 3(31) = 177
84 + 93 = 177
177 = 177