Question

Simplify and find the value of the simplified expression when x = -1 and y = 2. a) 3( 2x²- 4y² ) - ( 7xy-( 3(x³-2y²) - 2xy

Answer 1

Answer:

-19

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Step-by-step explanation:

to solve this, we must first open all brackets, and then replace x and y with the respective values.

3( 2x²- 4y² ) - ( 7xy-( 3(x³-2y²) - 2xy

= 6x² -4y² - (7xy-(3x³ - 6y²) - 2xy

= 6x² -4y² -(7xy -3x³ +6y²) - 2xy

= 6x² -4y² -7xy +3x³ -6y² -2xy

= 3x³ +6x² -10y² -9xy

now, we substitute the variables with their values.

=3(-1)³ + 6(-1)² -10(2)² - (9x-1x2)

= -3 + 6 - 40 + 18

= -19