Step-by-step explanation:
4x² - 12x + 17 = 0
i is an imaginary number and it equals √-1, and you usually put it when the number under the root is negative.
So √-5 = √5i and √-4 = 2i
I need some help for school.
1 answer:
I can help with B, but parts A and C are for you to come up with on your own. Anyways, to rewrite the equation with multiplication, the problem is asking you to change the division into a fraction. Anytime you divide a fraction, you need to flip the numerator (the top number) and the denominator (the bottom one), and change the divide sign into a multiplication one. So the equation would look like.
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5π/12 = (5 · 180°) : 12 = 75°
cos 75° = cos ( 45° + 30° )= cos 45° cos 30° - sin 45° sin 30° =
=√2/2 * √3/2 - √2/2 * 1/2 =
=(2.4495 - 1.4142): 4 = 0.258825
cos 75° = cos ( 45° + 30° )= cos 45° cos 30° - sin 45° sin 30° =
=√2/2 * √3/2 - √2/2 * 1/2 =
=(2.4495 - 1.4142): 4 = 0.258825