Question

1.Factor completely 5x2 - 40.

5(x + 8)(x - 8)

5(x2 - 8)

5(x + 8)(x - 5)

Prime

2.Which shows 522 - 482 being evaluated using the difference of perfect squares method?

522 - 482 = (2704 + 2304)(2704 - 2304) = 2,003,200

522 - 482 = (52 + 48)(52 - 48) = (100)(4) = 400

522 - 482 = 2704 - 2304 = 400

522 - 482 = (52 - 48)2 = (4)2 = 16

3.Factor completely x2 + 25.

(x + 5)(x + 5)

(x + 5)(x - 5)

(x - 5)(x - 5)

Prime

4.Factor completely x2 - 36.

(x + 6)(x - 6)

(x + 6)(x + 6)

(x - 6)(x - 6)

Prime

Answer 1

1. The GCF is 5, so the answer is 5(x^2-8)
2. B looks correct to me
3. A because it's all positive
4. A because one positive one negative