2 years ago

Simplify the following expression:

Mathematics

1 answer:

Morgarella [4.7K]2 years ago

8 0

Answer:

2nd option

Step-by-step explanation:

Given

2x - 8y + 3x² + 7y - 12x ← collect like terms

= 3x² + (2x - 12x) + (- 8y + 7y)

= 3x² + (- 10x) + (- y)

= 3x² - 10x - y

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A high school math teacher is grading her students' tests. The teacher spends about 4 minutes grading each test. The teacher has

gavmur [86]

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2 years ago

Please help me ASAP?!!

Blababa [14]

Answer:

(0,-5) and (-4,3)

Step-by-step explanation:

The given equations are

$\left \{ {{x^2+y^2=25} \atop {2x+y=-5}} \right.$

Make y the subject in the second equation;

$y=-2x-5$

Substitute into the first equation;

$x^2+(-2x-5)^2=25$

Expand:

$x^2+4x^2+20x+25=25$

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When x=0,

$y=-2(0)-5=-5$

This gives; (0,-5)

When x=-4

$y=-2(-4)-5=3$

This gives (-4,3)

7 0

2 years ago

Read 2 more answers

Solve: (a + 11)9 <br><br>plz help ill give the first person brainliest i need it in 10 minutes

ser-zykov [4K]

$\\ \tt\longmapsto 9(a+11)$

Apply distributive law

a(b+c)=ab+ac

$\\ \tt\longmapsto 9a+9(11)$

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1 year ago

Hello I need help with my math homework that I don’t understand if you could help me out the would be great thank you

Klio2033 [76]

Answer:

3) 10

4) 12

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Step-by-step explanation:

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2 years ago

2.8y + 6 +0.2 y =5y -14

serious [3.7K]

2.8y + 6 + 0.2y = 5y - 14
(Simplify like terms in first half of equation)
3y + 6 = 5y - 14
(Subtract both sides by 3y)
6 = 2y - 14
(Flip)
2y - 14 = 6
(Add both sides by 14)
2y = 20
(Divide both sides by 2)
y=10

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2 years ago