Question

Evaluate the expression 3a - 2ab if a= 4 and b= 6 please explain, thank you !

Answer 1

Answer:

3a - 2ab if a= 4 and b= 6 = -36

-7x + 5 = 8x -25 solve for x = 2

Step-by-step explanation:

Evaluate 3 a - 2 a b where a = 4 and b = 6:

3 a - 2 a b = 3×4 - 2×4×6

3×4 = 12:

12 - 2×4×6

-2×4 = -8:

-8×6 + 12

-8×6 = -48:

-48 + 12

12 - 48 = -(48 - 12):

-(48 - 12)

| 4 | 8

- | 1 | 2

| 3 | 6:

Answer: -36

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Solve for x:

5 - 7 x = 8 x - 25

Subtract 8 x from both sides:

5 + (-7 x - 8 x) = (8 x - 8 x) - 25

-7 x - 8 x = -15 x:

-15 x + 5 = (8 x - 8 x) - 25

8 x - 8 x = 0:

5 - 15 x = -25

Subtract 5 from both sides:

(5 - 5) - 15 x = -5 - 25

5 - 5 = 0:

-15 x = -5 - 25

-5 - 25 = -30:

-15 x = -30

Divide both sides of -15 x = -30 by -15:

(-15 x)/(-15) = (-30)/(-15)

(-15)/(-15) = 1:

x = (-30)/(-15)

The gcd of -30 and -15 is -15, so (-30)/(-15) = (-15×2)/(-15×1) = (-15)/(-15)×2 = 2:

Answer: x = 2

Answer 2

Answer: 6

Step-by-step explanation: