Solve for x.
1 answer:
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.. :)
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.. :)
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Answer:
4 - i
Step-by-step explanation:
Intuitively, the answer will be 4 - i, as the other numbers are too big to have a square as small as 17i. Also, we know that i will not be in the end result, which means that we should have a negative in the result as well.
To test this, we can simply treat 4 and -i as the sides of a right triangle and find the hypotenuse:
So indeed the answer is 4 - i