Factor completely 3x2 − 21.
3(x2 − 7)
3(x + 7)(x − 7)
3(x + 7)(x − 3)
prime

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ANSWER

EXPLANATION

The given expression is

The highest common factor is 3.

Factor 3 to obtain,

We could have imposed difference of two squares on the expression in the parenthesis to factor further. But the result is not part of the given options.

Hence the correct answer is A.

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)