Simplify the expression 2√ 20 − 3√ 7 − 2√ 5 + 4√ 63 .
2 answers:
Answer:
A
Step-by-step explanation:
Simplify the expression by reducing the square roots if possible:
Since 4 and 9 are factors within the square root and perfect squares themselves, they can be removed to outside the square root. This simplifies the roots into two types and
. To combine like terms, subtract the coefficients in front of them.
A is the solution.
You might be interested in
Answer:
Correct option is C
Step-by-step explanation:
First, find the equation of the boundary line. This line passes through the points (0,-3) and (-2,1). Then it has equation
In the attached diagram this boundary line is solid, then the sign of the inequality should be with "or equal to" notion (≤ or ≥). Thus, options A and B are false.
The line divides the coordinate plane into two parts and you have to determine which part to choose. The origin does not lie in the shaded region, then its coordinates cannot satisfy the inequality. Check options C and D.
- origin does not satisfy (option C is correct);
- origin satisfies (option D is false).