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3 years ago

Josephine solved a quadratic equation. Her work is shown below.

Mathematics

1 answer:

mariarad [96]3 years ago

7 0

Answer:

Step-by-step explanation:

hello :

5(x + 7)² = 245

(x + 7)² = 49

x=0 is solution but you have other solution -14 because :(-14+7)² = (-7)² =49

here is an solution Step-by-step :

(x + 7)² = 49 means : (x + 7)² = 7²

(x + 7)² - 7²=0 use identity : a²-b² = (a-b)(a+b)

a=x+7 and b= 7

(x+7-7)(x+7+7) = 0

x(x+14)=0

x=0 or x+14=0

so : x=0 or x= -14

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antoniya [11.8K]

Answer:

16.2 cm

Step-by-step explanation:

use the pythagoran theorem

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3 years ago

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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3 years ago

Consider the tangent line to the curve y = 6 sin(x) at the point (π/6, 3). (a) Find a unit vector that is parallel to the tangen

mojhsa [17]

Answer:

$y=\frac{\pi }{6}+5.196(x-3)$

Step-by-step explanation:

We have given the equation y = 6 sin (x)

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As it passes through the point $(\frac{\pi }{6},3)$

So $\frac{dy}{dx}=6cos\frac{\pi }{6}=5.196$

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3 years ago