Math) 5X - 9 = 11?

Answer 1

5x = 20
x = 4

Answer 2

Switch the problem around to be 5x = 11 + 9

so 5x = 20
divide both sides by 5
x=4

Check it 5(4) - 9 =11
20 - 9 =11

Answer 3

sqrt(5x + sixty 5) - 9 = 3x - 20 sqrt(5x + sixty 5) = 3x - 11 sq. the two factors: 5x +sixty 5 = (3x - 11)^2 5x + sixty 5 = 9x^2 - 66x + 121 0 = 9x^2 - 71x +fifty six = 0 0 = (9x - 8)(x - 7) so the two 9x - 8 = 0 ==> x = 8/9 or x - 7 = 0 ==> x =7 now verify your solutions: x = 7 ==> sqrt(35 +sixty 5) - 9 = 3(7) - 20? sqrt(a hundred) - 9 = 10 - 9 = a million = 21 - 20 tests x = 8/9 ==> sqrt(5x +sixty 5) - 9 = sqrt(40/9 + sixty 5) - 9 = sqrt(40/9 + 585/9) - 9 = sq.(625/9) - 9 = 25/3 - 27/3 = -2/3 RHS: 3(8/9) - 20 = 24/9 - 20 = 24/9 - one hundred eighty/9 = -156/9 =/= -2/3 x = 8/9 is extraneous one answer: x = 7 continually you're able to study recommendations to radical equations for extraneous recommendations edit: Anthony: the sq. root of sixty 4 is 8 (and in straightforward terms 8), not +/- 8 it incredibly is diverse than fixing x^2 = sixty 4,the place x does equivalent +/- 8 it extremely is the reason you're able to study for extraneous recommendations: by capacity of squaring the two factors, you lose music of what grew to become into detrimental and what grew to become into helpful to start with take a seem on the curve y = sqrt(x) to cajole your self... there's no decrease 0.5 of the curve -- in straightforward terms non-detrimental values that's a various curve than y^2 = x

Answer 4

x=4

Answer 5

What you do is since the 9 in the problem is subtracted it is a negative. You take this negative nine and turn it into a positive which you then add onto 11. This gets you 5x=20
Once you have this you divide by 5 so you can get x all alone.
this will get you x=4

Answer 6

x= 4, add 9 to the 11 and divide by 5

Answer 7

add 9 to both sides.

5x - 9 (+9) = 11 (+9)
which makes it:

5x = 20

divide by 5

5x divided by 5 is X. 20 divided by 5 is 4. so that means:

X = 4

there it is.

Answer 8

5x-9=11
+9 +9
______
5x = 20
5x/5 = 20/5
x=4

these are the steps to finding the answer that is x=4

Answer 9

you add 9 to both sides, which makes it 5x=20 then divide 5 to both sides which makes it x=4.

Answer 10

4 dugh