Chris and Bianca got 80 points in all the spelling contest each child got more than 20 points could each child have gotten.
2 answers:
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I think what you mean is:
Then using our rules of exponents, this is the same as
Then using our rules of exponents, this is the same as
We presume you want to find values of x that make this true.
Subtract the right side and factor:
Once you have factors whose product is zero, you can find the values of x that make those factors zero. A product can only be zero if one or more contributing factors is zero.
To solve 2x-5=0, you can add 5 then divide by 2:
... 2x -5 = 0
... 2x = 5
... x = 5/2