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shayambros
09.12.2019 •
Mathematics
Can anyone me step by step on how to solve this problem?
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Ответ:
see explanation
Step-by-step explanation:
The volume (V) of a cuboid is calculated using the formula
V = lbh ( l is length, b is breadth and h is height )
Equate the product of the dimensions to 374
2(x + 3)(x + 9) = 374 ( divide both sides by 2 )
(x + 3)(x + 9) = 187 ← expand factors on left side
x² + 12x + 27 = 187 ( subtract 187 from both sides )
x² + 12x - 160 = 0 ← in standard form
Factor by considering the factors of the constant term (- 160) which sum to give the coefficient of the x- term (+ 12)
The factors are + 20 and - 8, hence
(x + 20)(x - 8) = 0
Equate each factor to zero and solve for x
x + 20 = 0 ⇒ x = - 20
x - 8 = 0 ⇒ x = 8
solutions are x = - 20, x = 8
However x > 0 ⇒ x = 8 and
x + 3 = 8 + 3 = 11
x + 9 = 8 + 9 = 17
Dimensions are 2cm, 11 cm, 17 cm
Ответ:
you have to make an equation for the volume
volume = l × w × d
subsitute values given
2 × (x+3) × (x+9) = 374
multiply (x+3) and (x+9) first
2 × (x^2+12x+27) = 374
multiply left side by 2
2x^2 + 24x + 54 = 374
everything is divisible by 2 so you can divide by 2 on both sides to make it simpler
x^2 + 12x + 27 = 187
minus 187 on both sides to set equation equal to 0
x^2 + 12x - 160 = 0
factorise with two factors of -160 that add up to give 12
(x + 20)(x - 8) = 0
x + 20 = 0
x - 8 = 0
therefore
x = 8x = -20
however, x cannot be -20 as it is representing lengths, which cannot be negative.
so the solution we must use later on is 8.
the dimensions of the cuboid are
2
x + 3
x + 9
we know the value of x which is 8 so we substitute this.
dimensions:
2
8 + 3
8 + 9
therefore the dimensions of the cuboid are:
2cm, 11cm, 17cm
Ответ:
y = 2x² + 3x - 9
Step-by-step explanation:
Given αβ = -
= ![\frac{c}{a}](/tpl/images/0727/9678/d37f6.png)
and α + β = -
= - ![\frac{b}{a}](/tpl/images/0727/9678/bd65f.png)
Then a = 2, b = 3 and c = - 9, thus
y = 2x² + 3x - 9