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miss Akunina [59]
3 years ago
13

If you’re good at geometry solve these 2 please

Mathematics
1 answer:
gizmo_the_mogwai [7]3 years ago
8 0

Answer:

13.

Let us say

first angle be = 4x -10

second angle = x

now add them to 90 as complementary angles add up to 90

4x - 10 + x = 90

5x - 10 = 90

5x = 90+10

5x = 100

x = 100/5

x = 20

the first angle = 4x -10

                       = 4(20) -10

                       = 80 -10

                       = 70

the second angle = x

                             = 20

the angles are 70 and 20

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. Factorise the following expression fully<br><br>(a+1)²-4b²​
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The factoring the equation (a + 1)² - 4b² we get (a+1+2b)(a+1-2b).

<h3>What is the factoring function of (a + 1)² - 4 b²?</h3>

Given:  (a + 1)² - 4b²

Apply Perfect Square Formula, and we get

(a + b)² = a² + 2 a b + b²

(a + 1)² = a² + 2a1+1²

= a² + 2a1 + 1² - 4 b²

simplifying the equation, we get

a² + 2a1 + 1² = a² + 2a + 1

= a² + 2a + 1 - 4b²

Factor, a² + 2a + 1 = (a + 1)²

= (a + 1)² - 4 b²

Simplify 4 b² = (2 b)²

= (a + 1)² - (2b)²

Apply the Difference of Two Squares Formula, and we get

x² - y² = (x + y)(x - y)

(a + 1)² - (2b)² = ((a + 1) + 2b)((a + 1) - 2 b)

simplifying the equation, we get

= ((a + 1) + 2b)(a + 1) - 2 b)

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Therefore, the correct answer is (a+1+2b)(a+1-2b).

To learn more about factoring refer to:

brainly.com/question/25829061

#SPJ9

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