chelsea1524

08.09.2021 • 

Mathematics

Plz help for my test Q1. [2]
Fill the box with “ > ���� < ”
615− (−312) 912+ (−8110)
Q2 [2] By use number line, arrange each of the following in descending order
8, −8, 1012, 5.85, −6.28
5

Q3
Evaluate
(a) {[−25 + (2)3] − [(5)2 + 7)]} × (−5) [2]
(b) 8 ÷ [3 + (−15)] ÷ [(−2) × 4 × (−3)] [2]

Q4
Separate Rational and Irrational numbers from the given numbers 29 , −89, 3��,18,29, −8,27, 0.786787 …,
5

Ответ:

xEmqq2034

20.03.2021

Mathematics

---

see explanation

Step-by-step explanation:

Note that (x² + 5)(x² - 5) are the factors of a difference of squares

a² - b²  = (a + b)(a - b)

with a = x² and b = 5, hence

(x² + 5)(x² - 5) = (x²)² - 5² = - 25, thus

3( - 25) = 3 - 75

---

0,0(0 оценок)