It is exponent laws. My teacher said x is 3 but I don't get why

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asked Apr 17, 2017 106k views

1 Answer

Danatron · Answer 1 · 2017-04-23T17:47:58+0000

exponent laws

one of them goes liek this

if you have bⁿ=bᵃ where b=b, then n=a

so, try to match bases

2ˣ⁺⁴=128
128=2⁷

we have
2ˣ⁺⁴=2⁷
2=2
therefor
x+4=7
now subtract 4 from both sides
x=3

It is exponent laws. My teacher said x is 3 but I don't get why

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