What is expand (x-y=1,1)(2x+y=19) ?

The solution to expand (x-y=1,1)(2x+y=19) is 2x^2+xy=19

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expand (x-y=1,1)(2x+y=19)

expand

(x - y = 1, 1) (2 x + y = 19)

2 x^{2} + x y = 19

Solution steps

(x - y = 1, 1) (2 x + y = 19)

= (x - 1 \cdot 1 =, y) (2 x + 19 = y)

Apply FOIL method:

(a + b) (c + d) = a c + a d + b c + b d

a = x, b = - y = 1, 1, c = 2 x, d = y = 19

x \cdot 2 x + x y = 19 + (- y = 1, 1) \cdot 2 x + (- y = 1, 1) y = 19

Apply minus-plus rules

+ (- a) = - a

2 xx + x y = 19 - y = 1, 1 \cdot 2 x - y = 1, 1 \cdot y = 19

Expand

2 xx + x y : 2 x^{2} + x y

2 x^{2} + x y = 19

\frac{1}{( x ^{2} + 1 ) ( x - 1 )}

\frac{d}{d x} ((t) (t (2 t + 1)^{2}))

24 (x - \frac{1}{6})

- (2 x + 1) cos (5)

\frac{1}{( n + 1 ) \cdot ( n + 2 )}

What is expand (x-y=1,1)(2x+y=19) ?
The solution to expand (x-y=1,1)(2x+y=19) is 2x^2+xy=19