Book Maths Puzzle Algebra

Factor completely the following polynomials:
1) (a-b)^2 - 4(c-d)^2
2) 6(x-y)^2 + 23(x-y) - 4

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Book Other Question

Joe's thick and tasty salad dressing gets 45% of its calories from fat. Light and Lean dressing gets 20% of its calories from fat. How many ounces of each should be mixed in order i dont knoww how to do this 3/4multiplyed (8x+negitive20}=1/2times(neg.16x+neg.4)+1 can u help me please!