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liq [111]
2 years ago
11

Simplify the following expressions and then find the numerical values for x = -2.

Mathematics
1 answer:
galina1969 [7]2 years ago
5 0

Step-by-step explanation:

for the given value x = -2

= 3(2x-4) + x^2 +5

= 3(-4 -4) +4+5

= -24+9

= -15

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raketka [301]
Hcucinoboff gc yackbxtrTvlbcycibov
8 0
3 years ago
Factorise the following.​
spin [16.1K]

Answer:

x²(9x– 11)(9x + 11)

Step-by-step explanation:

81x⁴ – 121x²

The expression can be factorised as follow:

81x⁴ – 121x²

x² is common to both term. Thus:

81x⁴ – 121x² = x²(81x² – 121)

Recall:

81 = 9²

121 = 11²

Therefore,

x²(81x² – 121) = x²(9²x² – 11²)

= x²[(9x)² – 11²]

Difference of two squares

x²(9x– 11)(9x + 11)

Therefore,

81x⁴ – 121x² = x²(9x– 11)(9x + 11)

3 0
2 years ago
1 A line passes through (0, 2) and has a slope of 3. Which function's graph is parallel to this line?
motikmotik
D. y=mx+b. m being slope and b being the y intercept. so the equation for the line is y=3x+2 and to be parallel your m must be the same number so D. 3x
3 0
2 years ago
Find the cost of carpeting a 9 foot by 12 foot room at $30 per square yard.
S_A_V [24]
Area = length X width
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A = (12 ft)(1 yd/3 ft) x (9 ft)(1 yd/3 ft) 1 yard = 3 feet so 1 foot = 1/3 yard
A = 4 yd x 3 yd divide by 3 ft which cancels the original ft and leaves yd's
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8 0
2 years ago
Read 2 more answers
What is the solution to this equation? 2x+3=x-4​
g100num [7]

Answer:

x = -7

Step-by-step explanation:

2x+3 = x-4

2x-x = -4-3

x = -7

hope it helps ☺️

4 0
2 years ago
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