Question

5
Simplify these expressions and find their value if x = 1, y = - 1.
(a) x-[y - {2x - 5y - (7y - 3x)}]
(b) 5x – [x + 3y2 - {3x2 - (4 - 2y - 3y)]]
(c) 3x – [2y - {3x – (4y - 3x)}]
(d) 5-[x + 3y2 - {3x - (4 + 7y2 – 3x)}]
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Answer 1

Step-by-step explanation:

1)x-[y - {2x - 5y - (7y - 3x)}]

x-{y- (2x- 5y-7y +3 x)}

x-(y-5x - 12 y)

x-(-5 x -11y)

x+5 x +11y

6x+11y

6x+ 11y

6(1)+11(-1)

6+(-11)

6-11

-5