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intercepts of f(x)=sin(3x)

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vertices −3x²−2x+65

Solution

Maximum (−13 , 1915 )

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Find vertex using parabola form

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y=−3x²−2x+65

Parabola equation in polynomial form

The vertex of an up-down facing parabola of the form y=ax²+bx+c is x_v=−b2a

Rewrite y=−3x²−2x+65 in the form y=ax²+bx+c

y=−3x²5 −2x5 +65

The parabola parameters are:

a=−35 , b=−25 , c=65

x_v=−b2a

x_v=−(−25 )2(−35 )

Simplify −−25 2(−35 ) : −13

x_v=−13

Plug in x_v=−13 to find the y_v value

y_v=1915

Therefore the parabola vertex is

(−13 , 1915 )

If a<0, then the vertex is a maximum value
If a>0, then the vertex is a minimum value
a=−35

Maximum (−13 , 1915 )

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−▭▭	<	7	8	9	÷	`AC`
+▭▭	>	4	5	6	×	☐☐☐
×▭▭	(	1	2	3	−	`x`
▭ \|▭	)	.	0	=	+	`y`

intercepts of f(x)=sin(3x)

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