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dolphi86 [110]
3 years ago
13

Wat is 7x² + 4x - 5= 0

Mathematics
2 answers:
lara [203]3 years ago
5 0
7x^2+4x-5=0\\
\Delta=4^2-4\cdot7\cdot(-5)=16+140=156\\
\sqrt{\Delta}=\sqrt{156}=2\sqrt{39}\\
x=\dfrac{-4\pm2\sqrt{39}}{2\cdot7}=\dfrac{-2\pm\sqrt{39}}{7}
frosja888 [35]3 years ago
4 0
Answer and workings in the attachment below.

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Solve for the value of k
wel

Answer:

k=13

Step-by-step explanation:

3k+6+4k-7+90=180

7k+89=180

k=180-89/7

k=13

8 0
2 years ago
What is the difference between the compound interest and simple interest on rs 8000 at 15% per annum for 2 years?
Sladkaya [172]
Simple Interest:

I = P x r x t
I = 8000 x 0.15 x 2
I = 2400

Compound Interest:

A = P(e^rt)
where e is the Euclid’s constant
and A is the total amount with interest

A = 8000(e^0.15(2))
A = 10799 (rounded up)
Therefore compound interest is 2799.

The difference:
compound - simple = 2799 - 2400

Answer is rs 399.
3 0
3 years ago
Solve the system of linear equations by elimination.<br><br> 4x−3y=8<br> 5x−2y=−11
AleksandrR [38]

Answer:

(-7, -12)

Step-by-step explanation:

4x-3y=8

5x-2y=-11

Is there any of the like terms can be added and the result will be 0? No, so we have to multiple one OR both of the equations to make that one number do that.

(I will try to remove the y like terms so i will multiple both of them by the opposite so both of the ys will be 6)

2(4x-3y=8)

-3(5x-2y=-11)

8x-6y=16

-15x+6y=33

(now the easy part… cancel the 6s and add the equations)

8x+(-15x)=-7x

16+33=49

-7x=49

(divide 49 by -7)

x=-7

Replace x in any of the equations and you’ll get the y value.

4x-3y=8

4(-7)-3y=8

-28-3y=8

-3y=36

y=12

Threfore, there is one solution which is….. (-7,-12)

7 0
2 years ago
BRAINLIEST AND MAX PTS<br><br> CONVERT y = 40x + 600 to point-slope form
IRISSAK [1]

Answer:

The answer to your question is y - 0 = 40(x - 15)

Step-by-step explanation:

                                  y = 40x + 600

Convert to                 y - y₁ = m(x - x₁)          

Process

1.- Factor 40 in the right side of the equation

                                 y = 40(x - 15)

2.- Give the form of the point slope form

                                 y - 0 = 40(x - 15)

where

y₁ = 0

m = 40

x₁ = 15

3 0
3 years ago
Read 2 more answers
glenn bought a $5 coffee and four magazines. If he spent a total of $25 how much did each magazine cost?
ladessa [460]

Answer:

5 each

Step-by-step explanation:

we will minus the coffee from the total

25 - 5 = 20

there's was 4 magazines so we do...

20 ÷ 4 = 5

5 0
3 years ago
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