Darlene wrote this proof of the identity (x + y)2 - (x - y)2 = 4xy. which of the following is a justification for step 4 of her proof? step 1: (x + y)2 - (x - y)2 = (x + y)(x + y) - (x - y)(x - y) step 2: (x + y)(x + y) - (x - y)(x - y) = (x2 + xy + xy + y2) - (x2 - xy - xy + y2) step 3: (x2 + xy + xy + y2) - (x2 - xy - xy + y2) = (x2 + 2xy + y2) - (x2 - 2xy + y2) step 4: (x2 + 2xy + y2) - (x2 - 2xy + y2) = x2 + 2xy + y2 - x2 + 2xy - y2 step 5: x2 + 2xy + y2 - x2 + 2xy - y2 = 4xy a. reflexive property b. definition of squaring a binomial c. combining like terms d. distributive property

 D. Distributive Property

Step-by-step explanation:

Step 4: (x² + 2xy + y²) - (x² - 2xy + y²) = x² + 2xy + y² - x² + 2xy - y²

The difference between the left side and the right side is that the sign of the underlined terms changed because -1 was distributed into them.

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step-by-step explanation:

the multiples of 15 are 15, 30,45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195,   210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 360, 375,   390, 405, 420, 435, 450, 465, 480, 495, 510, 525, 540, 555, 570, 585, 600, 615, 630, 645, 660, 675, 690, 705, 720, and 735.

the factors of 15 are 1, 3, 5, and 15.

hope that , fam!

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