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3 years ago

What is the product of (x+3)(x+5)

Mathematics

2 answers:

11Alexandr11 [23.1K]3 years ago

6 0

Answer:

USE FOIL***** Inner outer and Center x^2 + 8x+ 15

Step-by-step explanation:

x times x is x^2

(3)(x) is 3x

(x)(5) is 5x

(3)(5) is 15

add like terms:

x^2 + 8x+ 15

Citrus2011 [14]3 years ago

5 0

Answer:

$x^{2}$ +8x+15

Step-by-step explanation:

we apply the distributive property

so we have

(x+3)*(x+5)

x*x+5*x+3*x+3*5

finally

we have

$x^{2}$ +8x+15

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Svetllana [295]

${ \qquad\qquad\huge\underline{{\sf Answer}}}$

Let's solve ~

Calculate discriminant :

$\qquad \sf \dashrightarrow \: 3 {x}^{2} + 6x - 1$

a = 3
b = 6
c = 1

$\qquad \sf \dashrightarrow \: discriminant = {b}^{2} - 4ac$

$\qquad \sf \dashrightarrow \: d = (6) {}^{2} - (4 \times 3 \times 1)$

$\qquad \sf \dashrightarrow \: d = 36 - 12$

$\qquad \sf \dashrightarrow \: d = 24$

$\qquad \sf \dashrightarrow \: \sqrt {d} = 2 \sqrt{6}$

Now, let's calculate it's roots ( x - intercepts )

$\qquad \sf \dashrightarrow \: x = \cfrac{ - b \pm \sqrt{d} }{2a}$

$\qquad \sf \dashrightarrow \: x = \cfrac{ - 6\pm 2 \sqrt{6} }{2 \times 3}$

$\qquad \sf \dashrightarrow \: x = \cfrac{ - 6\pm 2 \sqrt{6} }{6}$

So, the intercepts are :

$\qquad \sf \dashrightarrow \: x = \cfrac{ - 6 - 2 \sqrt{6} }{6}$

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Answer:

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Step-by-step explanation:

We want to find the variable

, so we have to make it alone. To do so, first subtract

from both sides of the equation:

−

Now divide both sides by

So the final answer is:

Hope this helps!

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2 years ago

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bonufazy [111]

Answer:

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Step-by-step explanation:

Please mark me as brainliest it would mean a lot

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