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rjkz [21]
3 years ago
11

Pls help u dont have to explain that much​

Mathematics
1 answer:
ira [324]3 years ago
3 0

Answer:

k = -7

Step-by-step explanation:

Given

x² - x - 42 = (x + k)(x + 6)

Required

Find k

x² - x - 42 = (x + k)(x + 6)

Expand the left hand side

x²-7x + 6x - 42 = (x + k)(x+ 6)

Factorize

x(x - 7) + 6(x- 7) = (x + k)(x+ 6)

Further factorize

(x - 7)(x + 6) = (x + k)(x + 6)

By comparison

x + k = x - 7

Subtract x from both sides

k = -7

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Answer:

y = 3x - 1

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6 0
3 years ago
24-4x=2x<br> show your work, will mark brainliest
vladimir2022 [97]

Answer:

x=4

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

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Step 2: Subtract 2x from both sides.

−4x+24−2x=2x−2x

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Step 3: Subtract 24 from both sides.

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5 0
3 years ago
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AfilCa [17]

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The function f(x) = sin x has all real numbers in its domain, but its range is

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How to solve such range questions?

Such questions in which every term is in addition and its range is asked is simplest ones to solve if we know the range of each of term. This can be seen from this question

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Learn more about range of trigonometric ratios here :

brainly.com/question/14304883

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Hope this helps!!!
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