Use the Pythagorean theorem to solve for x

15

Step-by-step explanation:

12^2 + 9^2 = 225

square root of 225 = 15

x=15

Step-by-step explanation:

Who doesnt love pythagorean theorem -_- eheheheh

12 ^2 + 9^2 = c^2

144+ 81 = c^2

225=c^2

square root of 225 is 15

15 = c which is the hypotenuse

so since c= x

x= 15

answer: ouch. thats difficult

step-by-step explanation:

d, x=8

step-by-step explanation:

simplifying

4x + -5 = 2x + 11

reorder the terms:

-5 + 4x = 2x + 11

reorder the terms:

-5 + 4x = 11 + 2x

solving

-5 + 4x = 11 + 2x

solving for variable 'x'.

move all terms containing x to the left, all other terms to the right.

add '-2x' to each side of the equation.

-5 + 4x + -2x = 11 + 2x + -2x

combine like terms: 4x + -2x = 2x

-5 + 2x = 11 + 2x + -2x

combine like terms: 2x + -2x = 0

-5 + 2x = 11 + 0

-5 + 2x = 11

add '5' to each side of the equation.

-5 + 5 + 2x = 11 + 5

combine like terms: -5 + 5 = 0

0 + 2x = 11 + 5

2x = 11 + 5

combine like terms: 11 + 5 = 16

2x = 16

divide each side by '2'.