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3 years ago

F(x) = 2x² + 3x - 5; f(-4) f(-4)=

Mathematics

2 answers:

Lisa [10]3 years ago

7 0

Answer:

Step-by-step explanation:

Hello!

We can solve this question by plugging in -4 for x in the original expression, and simplifying.

<h3>Evaluate</h3>

f(x) = 2x² + 3x - 5
f(-4) = 2(-4)² + 3(-4) - 5
f(-4) = 32 - 12 - 5

f(-4) = 15

The value of the expression when x = -4 is 15.

Korolek [52]3 years ago

6 0

$\underline{ \underline{ \boxed{\huge \frak{ {\color{orange}{ \: Answer :✓ } }}}}}$

Given Function :

$\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( x ) = 2x² + 3x - 5}$

$\: \: \:$

Put x = -4 in given function :

$\: \:$

$\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( x ) = 2x² + 3x - 5}$

$\: \:$

$\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) = 2( \: - 4 \: )^{2} + 3 ( - 4) - 5}$

$\: \:$

$\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) =2( \: 16 \: ) + 3( - 4) - 5}$

$\: \:$

$\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) =32 - 12 - 5}$

$\: \:$

$\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) =20 - 5}$

$\: \: \:$

$\red{\underline{ \boxed{\large {\color{lavender}↝ }\frak{\: \: \: \: \: \: f ( - 4 ) = 15 \: ✓}}}}$

$\: \:$

Hope Helps!

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3 years ago

In triangle XYZ, if angle X is congruent to angle Z, XY = 13x - 21, YZ = 8x - 6, & XZ = x + 4, find x & the measure of e

Naily [24]

Answer:

Given: In triangle XYZ, $\angle X \cong \angle Z$ , XY=13x-21 , YZ=8x-6 and XZ=x+4.

If two angles are congruent if and only if, they measure the same number of degrees.

therefore, from the given condition; $\angle X = \angle Z$ .

Isosceles Triangle : An triangle with two equal sides. The angles opposite the equal sides are also equal.

Therefore, the triangle XYZ is an isosceles triangle, as the base angle $\angle X$ and $\angle Z$ are equal and the sides opposite to these angles are also equal i.e, XY=YZ.

Since, we have XY=YZ ,

⇒ 13x-21 =8x-6 or

13x-8x=21-6 or

5x=15

Simplify:

x=3

Therefore, the sides of an isosceles triangle are:

XY = 13x-21 = $13\cdot 3 -21$ = 39-21 = 18 unit ,

YZ = 8x-6 = $8 \cdot3 -4$ = 24-6 =18 unit,

and XZ = x+4 = 3+4 =7 unit.

Since, the triangle is isosceles, we draw a line from an vertex angle Y of a triangle XYZ which is perpendicular (i.e, of 90 degree angle) to opposite side meets the opposite side at its midpoint i.e, say W.

As W is the midpoint(i.e, it divide the sides into two equal halves),

XW=WZ = $\frac{7}{2} =3.5$ unit

Now, use the Pythagorean theorem, to find the altitude WY.

⇒ $(WY)^2+(WZ)^2=(YZ)^2$

Substitute the value of WZ = 3.5 unit and YZ = 18 unit in above formula to calculate the length of WY;

⇒ $(WY)^2+(3.5)^2=(18)^2$

Simplify:

$(WY)^2=324-12.25=311.75$ or

$WY=\sqrt{311.75}$

On simplify we get;

WY=17.65 unit(approx.)

The vertex angle Y is split into two equal angles, we can find the vertex angle by finding the one of the base angle by using the fact; $Cosine = \frac{Base}{Hypotenuse}$ .