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zvonat [6]
3 years ago
12

Factorise (x+y)^2-(4-x)^2​

Mathematics
1 answer:
vovikov84 [41]3 years ago
4 0

Answer:

by using the identity a square - b square = (a+b)*(a-b)

a = x+y

b=4-x

= (x+y + 4-x)(x+y - 4-x)

y+4 * x+y -4+x

y+4*2x+y-4

2xy+y square -4y + yx + 4x + 4y - 16 +4x

3xy +y square + 8x -16

Step-by-step explanation:

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It is given in the problem that out of 25 students in Hansels class 17 students went to the class trip to the zoo. From the above information it is easy to find the percentage of students that went for the class trip to the zoo.
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