Question

(2x-5y) (2x+5y) if x=2 and y=1​

Answer 1

Step-by-step explanation:

x = 2

y = 1

(2x-5y)(2x+5y)

(a-b)(a+b) = a²-b²

so..

(2x)² - (5y)²

(2*2)² - (5*1)²

4² - 5²

16-25 = -9

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Answer 2

Answer:

-9

Step-by-step explanation:

(2x-5y)(2x-5y)

= (2X2-5X1)(2X2+5X1)

= (4-5)(4+5)

= -9