PLEASE HELP!!!!!!

Mathematics

2 answers:

Monica [59]3 years ago

6 0

Answer: The correct options are

(C) x = -6

(D) x = 6.

Step-by-step explanation: We are given to select the values of x that are the solutions to the following equation :

$5x^2-136=44~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)$

The solution of the given equation (i) is as follows :

$5x^2-136=44\\\\\Rightarrow 5x^2=44+136\\\\\Rightarrow 5x^2=180\\\\\Rightarrow x^2=\dfrac{180}{5}\\\\\Rightarrow x^2=36\\\\\Rightarrow x=\pm\sqrt{36}~~~~~~~~~~~~~~[\textup{taking square root on both sides}]\\\\\Rightarrow x=6,~-6.$

Thus, the solutions to the given equation are x = -6 and x = 6.

Option (C) and (D) are correct options.

Reika [66]3 years ago

5 0

Answer:

x=6

Step-by-step explanation:

5x^2-136=44

add 136 to both sides

5x^2=180

divide both sides by 5

x^2= 36

take square root of both sides

x=6

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5 0

3 years ago

A=2b^3-1 what's the value of b if a is 13

skelet666 [1.2K]

$\sf~A=2b^3-1$

Plug in A = 13

$\sf~13=2b^3-1$

Add 1 to both sides:

$\sf~14=2b^3$

Divide 2 to both sides:

$\sf~7=b^3$

Find the cube root of both sides:

$\sf~b=\sqrt[3]{7}$

$\sf~b\approx~1.91$