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2ab
If you have a real number,a, and raise it to a power b we say a^b is a times itself b times. That is to say aaaaaaaa...aaa b times. a is the base and b is the exponent. So if b is an integer,... -3,-2,-1,0,1,2,3... ,then we have an integral exponent. Examples are 2^5 and 2^-3. An example that is NOT an integral exponent is 2^(1/2) since 1/2 is not an integer. Dr. ChuckIt means that the exponent is a whole number, for example 3, 0, or -5.
2 x 2 x 2 x a x a x a x b x b
A number a multiplied b times (so a x a is b=2, a x a x a is b=3, a x a x a x a is b = 4, and so on) is written as ab. Since 2 is multiplied 4 times, you have 24.
It is: 5*(b+2) which is the same as 5b+10