Question

Solve for x.

5x2 – 45 = 0

A.
{9}

B.
{3}

C.
{9, –9}

D.
{3, –3}


(sorry if I'm spamming questions, I just need help on some of the questions and I barely post any questions on here.)

Answer 1

Hey there.. Lets solve this problem step by step

Given problem --> 5x² - 45 = 0

Step 1 - adding both sides by 45
5x² - 45 + 45 = 0 + 45
5x² = 45

Step 2 - dividing both sides by 5

`(5)/(5) x^2 = (45)/(5)`
x² = 9

Step 3 - taking square root on both sides to find the value of x
√x² = √9
x = 3 and -3

So correct option is D.

Hope this helps you.. :)