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mariarad [96]
2 years ago
8

Help please, tank u :)

Mathematics
1 answer:
elena-s [515]2 years ago
5 0

Answer:

16 ft

Step-by-step explanation:

Let the width of the rectangle be x ft

Therefore, length = (x + 2) ft

Area of the rectangle = 15 square ft

x(x + 2) = 15 \\  \\  {x}^{2}  + 2x = 15 \\  \\  {x}^{2}  + 2x - 15 = 0 \\  \\  {x}^{2}  + 5x - 3x - 15 = 0 \\  \\ x(x + 5) - 3(x + 5) = 0 \\  \\ (x + 5)(x - 3) = 0 \\  \\ x + 5 = 0 \: or \:  \: x - 3 = 0 \\  \\ x =  - 5  \:  \: or \:  \: x = 3 \\  \\  \because \: x \: can \: not \: be \:  - ve \\  \\  \therefore \: x = 3 \\   \\  \implies \: x + 2 = 3 + 2 = 5 \\  \\ perimeter \: of \: rectngle  \\ = 2(5 + 3)  \\  = 2 \times 5 \\  = 16 \: ft

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multiply equation 1 by -1
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add equation 1 and equation 2
-y=-x²
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Group terms that contain the same variable, and move the constant to the opposite side of the equation

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for x=-1
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the answer is
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3 years ago
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2 years ago
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Answer:

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Step-by-step explanation:

Let Ben has b,

sean has s

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samantha has s

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We need to write the words into equations and solve as we can.

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Let's put 2nd equation in first, to get:

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