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Three more than 4 times a number is equal to 9 less than twice the number.

Seven times the sum of 4 and a number is -14

Twice a number plus 5 is equal to 27

What are they?

Respuesta :

C1042

Answer:

  1. x = 6 & -2
  2. x = -6
  3. x = -4.69 & 4.69

Step-by-step explanation:

Let unknown no. = x

1)

3 + 4x = x² - 9

x² - 4x - 9 - 3 = 0

x² - 4x - 12 = 0

(x-6)(x+2) = 0

x = 6 & x = -2

2)

7(4+x) = -14

4 + x = -2

x = -6

3)

x² + 5 = 27

x² = 22

x = +-√22

x = +√22

= 4.69 (3s.f)

x = -√22

= -4.69 (3s.f)

(Correct me if i am wrong)

tanisha37
#3+4=9-2
or,3+4+2=9
9=9
#7*3+6=27
#22+5=27
These are the answers
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