3 years ago

Help me please I don’t understand

Mathematics

1 answer:

Mamont248 [21]3 years ago

7 0

For question between 13 -> 17 replace n with the number.

Example:
13.) n = 2; 2+(-1) = 1

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HELP!

maksim [4K]

Part A

$4x^2 -7x-15=0\\\\(4x+5)(x-3)=0\\\\x=-\frac{5}{4}, 3$

So, the x-intercepts are $\boxed{\left(-\frac{5}{4}, 0 \right), (3,0)}$

Part B

The vertex will be a minimum because the coefficient of $x^2$ is positive.

The x-coordinate of the vertex is $x=-\frac{-7}{2(4)}=\frac{7}{8}$

Substituting this back into the function, we get $f\left(\frac{7}{8} \right)=4\left(\frac{7}{8} \right)^2 -7\left(\frac{7}{8} \right)^2 -15=-\frac{289}{16}$

So, the coordinates of the vertex are $\boxed{\left(\frac{7}{8}, -\frac{289}{16} \right)}$

Part C

Plot the vertex and the x-intercepts and draw a parabola that passes through these three points.

The graph is shown in the attached image.

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What is the perimeter of the figure ( 50in 10in 40in 18in )

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The length of rectangular garden is 6 feet longer than the width. If the area of the garden is 16 square feet, find the length a

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16 = (x + 6)(x)

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