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3 years ago

The width of a rectangle is 2cm less than its length. The perimeter of the rectangle is 16 cm.

Mathematics

1 answer:

avanturin [10]3 years ago

8 0

Answer:

Step-by-step explanation:

Let the Length of the rectangle = x

Width = x - 2

Perimeter = 16 cm

2 * ( length + width) = 16

2 * ( x + x-2 ) = 16

2 * (2x - 2) = 16

2x - 2 = 16 /2

2x - 2 = 8

2x = 8+2

2x= 10

x = 10/2

x = 5

Length of the rectangle = 5 cm

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What is the value of the expression 5x2 + 2x when x = 5?

masha68 [24]

Answer:

135

Step-by-step explanation:

Given:

$x = 5$

To determine a numerical value for the expression, simply substitute the value of "x" into the expression and simplify the expression, if necessary, to determine a specific number for the expression provided.

$\implies 5x^{2} + 2x$

$\implies 5(5)^{2} + 2(5) \longrightarrow \longrightarrow \longrightarrow (x = 5)$

$\implies 5(5)(5) + 2(5)$

$\implies 125 + 10$

$\implies 135$

Therefore, the value of the expression $5x^{2} + 2x$ when x = 5 is 135.

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