Question

HELP!! 7x^2+5=530
solve by taking square roots

Answer 1

I'll get you started
\[\Large 7x^2+5=530\]
\[\Large 7x^2+5-5=530-5\]
\[\Large 7x^2=525\]
\[\Large \frac{7x^2}{7}=\frac{525}{7}\]
\[\Large x^2=75\]
and I'll let you finish

Answer 2

the choices are:: a) {i square root 3, -i square root 3}
b) {i square root 5}
c) {5 square root 3, -5 square root 3}
d) {5 square root 3}

Answer 3

@jim_thompson5910

Answer 4

do you see how I got to x^2 = 75

Answer 5

yea,, you divide 525 and 7

Answer 6

so we have x^2 = 75, what is x equal to? how do we find x?

Answer 7

by the 7x^2 divide by 7

Answer 8

\[\Large x^2 = 75\]

Answer 9

what undoes squaring?

Answer 10

i dont know

Answer 11

@jim_thompson5910

Answer 12

example

take the number 5 and square it to get 25

to undo that, you square root 25 to get 5 back

Answer 13

so if we square x, we do what to undo that operation?

Answer 14

im just confuse cuz i got 75 but its not on the choices

Answer 15

you take the square root of that to isolate x

\[\Large x = \pm\sqrt{75}\]

Answer 16

you simplify from there