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 on some of the questions and i barely post any questions on here.)

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

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.. :)