Question

Simplify 12 – 3 (5x – 4y) and then find the value for x = 2 & y = 3.​

Answer 1

Step-by-step explanation:

5xy(3x+4y−7)−3y(xy−x2+9)−8      

= 15x2y+20xy2−35xy−3xy2+3x2y−21y−8      

= 18x2y+17xy2−35xy−27y−8 When $$x 

= 2, y -1,wehave=18(2)^2 x (-1) + 17(2) (-1)^2 - 35(2) (-1) - 27(-1) - 8$$ 

= 18×4×(−1)+17×2×1−35×2×(−1)−27×(−1)−8 

= −74+34+70+27−8 

= 131−80 

= 51

Answer 2

SOLUTION

TO DETERMINE

• Simplify 12 – 3 (5x – 4y)

• The value for x = 2 & y = 3.

EVALUATION

Here the given expression is

12 – 3 (5x – 4y)

We first simplify the expression

12 – 3 (5x – 4y)

= 12 - 15x + 12y

= - 15x + 12y + 12

We now find the value

Putting x = 2 & y = 3 we get

The required result

= ( - 15 × 2 ) + ( 12 × 3 ) + 12

= - 30 + 36 + 12

= 18

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