Question

which expression is equal to 2 square root of 28 - 5 the square root of 63? a. -11 square root of 7, b. -37 the square root of 7, c. the square root of -7, d. square root of 7

Answer 1

Answer:

The correct answer is A. - 11 square root of 7.

Step-by-step explanation:

We have the expression 2 √28 - 5 √ 63 and we have to find and equal expression.

Let's simplify it:

2 √28 - 5 √ 63

2 √7 * 4 - 5 √ 9 * 7 (28 is also equal to 7 * 4 and 63 is equal to 9 * 7)

2 * 2 √7  - 5 * 3 √ 7

4 √7 - 15 √7

- 11 √7

The equal expression is A. - 11 square root of 7.