2 years ago

Factorise and solve x^2 + 4x -21 = 0

Mathematics

2 answers:

Korvikt [17]2 years ago

3 0

Answer:

(x + 7) (x - 3)

Step-by-step explanation:

Find 2 numbers that add to 4 and multiply to -21

(x + 7) (x - 3)

Ahat [919]2 years ago

3 0

Answer:

(x+7)(x-4) x=-7,4

Step-by-step explanation:

The factors of -21 that add up to 4 are 7 and -3, so put those as your two second values in your binomials and solve for x, in this case being the negative versions of the second term in the binomial

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Answer:

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Step-by-step explanation:

For 22 hours, he earns 22 times his hourly pay.

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3 years ago

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Kisachek [45]

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Step-by-step explanation:

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3 years ago

Write the product in standard form. ( 9 + 5i)( 9 + 8i)

disa [49]

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3 years ago

What is the slope of line segment AB? A) 2/3 B) 3/4 C) 4/3 D) -3/4

Lunna [17]

For this case we have that by definition, the slope of a line is given by:

$m = \frac {y_ {2} -y_ {1}} {x_ {2} -x_ {1}}$

Where:

$(x_ {1}, y_ {1})$ and $(x_ {2}, y_ {2})$ are two points through which the line passes.

According to the image we have:

$(x_ {1}, y_ {1}): (-5,3)\\(x_ {2}, y_ {2}): (3, -3)$

Substituting we have:

$m = \frac {-3-3} {3 - (- 5)} = \frac {-6} {3 + 5} = \frac {-6} {8} = - \frac {3} {4}$

Thus, the slope of the line is:

$m = - \frac {3} {4}$

Answer:

$m = - \frac {3} {4}$

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Answer:

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