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Natalija [7]
3 years ago
11

Malene wrote the equation x² + 8x + 60 = x² + 12x + 20 to show that the area of a changed rectangle is 60 cm² greater than the a

rea of the original rectangle. How did the rectangle change?
1 was added to each side.
2 was added to each side.
8 was added to each side.
10 was added to each side.
Mathematics
2 answers:
madreJ [45]3 years ago
8 0
The answer is 10 was added to each side.

x² + 8x + 60 = x² + 12x + 20

x² + 8x + 60 - x² = x² + 12x + 20 - x²

8x + 60 = 12x + 20
60 - 20 = 12x - 8x
40 = 4x
x = 40/4
x = 10

So, 10 was added to each side.
mel-nik [20]3 years ago
3 0

Answer:

2 was added to each side

Step-by-step explanation:

Given that a rectangle when changed sides, the area became 60 greater than the original

The equation given is

x^2 + 8x + 60 = x^2 + 12x + 20

From the above equation we can see that the original area wasx^2 + 8x

and it changed to

x^2 + 12x + 20

Original rectangle dimensions= factors of area terms = x , x+8

New rectangle dimensions = factors of x^2 + 12x + 20

=x+2, x+10

Thus we have both length and width increased by 2 units.

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