Question

please do this math question. please please do this it is very important for me please do the sum both I want now....​

Answer 1

Answer:

Answer

Step-by-step explanation:

7x = 5041- 4761

7x= 280

X= 40

Answer 2

Step-by-step explanation:

13. (2a - 7b)(2a +7b)(4a² + 49b²)

now applying formula

$(a + b)(a - b) = {a}^{2} - {b}^{2}$

= [(2a)² - (7b)²](4a² + 49b²)

= [4a² - 49b²] (4a² + 49b²)

now applying same formula again

= 16a⁴ - 2401 b⁴

14. 7x = 71² - 69²

now again applying same formula in reverse order

7x = (71 + 69) (71 - 69)

7x = 140 × 2

x = 20 × 2

x = 40