If (x+1)(x-3)=12, then which of the following statements is true?
a. x+1=0 or x-3=0
b. x+1=12 or x-3=12
c. x-5=0 or x+3=0

C.

Step-by-step explanation:

To solve the quadratic equation we need it to be equal to zero:

Now we factor the expression by putting in each parenthesis the square root of wich is . And we look for two numbers that when multiplied give -15 and when added they result in -2

Those numbers are -5 and +3

The factorization is as follows:

When we have something equal to zero, we have the options that either one of the two elements is equal to zero, or even both can be equal to zero, for this property, the above gives us the solutions:

and

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

i think it will be zero as slope has a formula of difference between initial and final distance divided by itz time interval