Question

how do i solve 7x(2) + 30 = 9

Answer 1

7x(2) is 7 x square

Answer 2

is this
\[7x^2+30=9\]?

Answer 3

yes 7x squared

Answer 4

then
\[7x^2=9-30=-21\]
\[x^2=-3\] and you are either stuck if you are using real numbers or else you get two complex solutions

Answer 5

7x^2 -21 =0
7(x^2-3) =0
x^2 -3 =0
x^2 = 3
x = + sqrt (3) or x = - sqrt(3)

Answer 6

ok i got both of your answers thanks guys

Answer 7

@rita i think it should be
\[7x^2=-21\] rather than
\[7x^2-21=0\]

Answer 8

yeah