若2x+1=8,则4x+1的值为?

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若2x+1=8,则4x+1的值为?
若2x+1=8,则4x+1的值为?

若2x+1=8,则4x+1的值为?
2x + 1 = 8
2x = 8 - 1
2x = 7
4x = 7×2
4x = 14
4x + 1 = 14 + 1
4x + 1 = 15

2x=8-1=7
4x=14
4x+1=15