Question

HII HELP PLEASE! I DONT UNDERSTAND​

Answer 1

Answer: C x = -2

Explanation:

`3x^(2) - 30x - 72 = 0`

[Add 72 on both sides]

`3x^(2) - 30x = 72`

[Factorise Left Hand Side of equation to get 3 on one side of a bracket]

`3(x^(2) -10x) = 72`

[Divide each side by 3 to just get the brackets and the x's on one side]

`x^(2) -10x = 24`

[Minus 24 on both side as the equation must = 0]

`x^(2) -10x-24=0`

[Solve the square on the left hand side]

`(x-12)(x+2)=0`

[Solve for x on left hand side - two possible answers]

`x-12=0 \\ x=12`

`x+2=0\\x=-2`

[The answer '12' is not in the option for the question so '-2' is the answer]

Answer 2

C

Explanation:

3x^2-30x=72

3(x^2-10x)=72

x^2-10x=24

Then do the subtitules

Answer:C

Give me brainlliest